Nationally Significant Infrastructure Projects and A303 Stonehenge Development Consent Order (DCO)

What is a Nationally Significant Infrastructure Project?

Nationally Significant Infrastructure Projects (often shortened to “NSIPs”) are defined in the 2008 Planning Act and subsequent regulations as large scale developments such as roads (promoted by Highways England), railways, harbours, power stations, transmission lines and pipelines, gas storage and others. Some are subject to size thresholds e.g. for a power station it is over 50 MW. These projects are taken through a separate planning application process to obtain a Development Consent Order (DCO).


1. Consultation (closed 14 August 2018)

It pays to get involved at the pre-application stage so that you get familiar with the details of the project and can start working out where the various players stand. You can use the consultation to push for alternative options that you think the developers should consider. If you consider that the developers are not consulting properly (eg the information is inadequate or the consultation is poorly publicised) then you can complain, but only to the developer – the Planning Inspectorate won’t get involved at this stage.

2. Email updates (available throughout the DCO process)

You should keep track of the project on the Planning Inspectorate website, and you can ask to receive email updates from them as the project progresses (note that this is NOT the same as registering as an interested party – see below).

The key time to get involved is after the application for a Development Consent Order (DCO) is formally submitted.  After this the process runs to a strict timetable.

3. DCO Application (submitted 16 November 2018)

The Planning Inspectorate have a set period of 28 days in which they have to decide whether or not to accept the application for examination. This is not a decision on the merits of the project; it is just a matter of whether or not the applicants have followed the process correctly, provided all the correct information etc.

Once the project is accepted then all the relevant documents have to be published by the developer. They can do this when the application is submitted for acceptance but they do not have to. In the case of the A303 Stonehenge Highways England has already submitted the application documents now published on the Planning Inspectorate website – all 302 of them.

4. Registration (closed 11 January 2019)

Shortly after acceptance, the Planning Inspectorate will open the application for registration as an interested party.

If you want to take part in any of the subsequent stages, you must register. If you don’t, you lose your right to submit further evidence or participate in the examination.

Registration is not difficult, but you have to do it within the set deadline and on the official form. You can complete the form online or request one through the post – but you can’t download it or make your own copies. The regulations specify that the registration period must run for a minimum of 28 (sometimes 30) days. The Planning Inspectorate usually allow around 5 – 6 weeks.

To register you need only provide your contact details and a written submission – called a “Relevant Representation” – which you are asked to keep to no more than 500 words.

You have only space to outline your arguments, but it’s important that you highlight your main concerns. This is because the Examining Authority calls the shots – they decide what matters are to be scrutinised and what questions are to be asked. If you haven’t set out your concerns clearly then they may not get an airing in the examination.

If you question the merits of the relevant National Policy Statements (NPS) then you won’t get much further because this is off-limits as far as the examination is concerned. Otherwise your registration has to be accepted so long as it is not “frivolous” or “vexatious”.

5. The Preliminary Meeting (date awaited)

After the registration period is over, there will be further communication to announce who will make up the Examining Authority (an appointed panel), a timetable, and an invitation to a Preliminary Meeting.

The Preliminary Meeting is an important stage because it’s here that the Examining Authority sets out how they’re going to carry out the examination. You can ask them to make sure that hearings are held at accessible locations and times, and to include certain key issues.

6. The Examination (timetable awaited)

This begins the day after the Preliminary Meeting and has to be finished within a statutory 6 month period.

It’s carried out mostly by exchange of written representations. The Examining Authority lays out the questions, you respond and so do the applicant and everyone else who wants to so long as they have registered. The Examining Authority sets a series of deadlines for responding to the questions, responding to other parties’ responses, responding to the next round of written questions, and so on. The overall plan is to narrow down the subject matter of the examination as it proceeds.

The Examining Authority will also set dates for a sequence of issue specific hearings. In these sessions evidence is given orally. You have the right to attend, but not to bring expert witnesses to give evidence or to cross-examine witnesses for the other side. You can request these but it is at the Examining Authority’s discretion whether you can do or not. The hearings consist for the most part of the Examining Authority asking questions of participants. A smart move for influencing the proceedings is to get them to ask the right questions.

There are also open floor hearings which are an important concession to the public’s right to participate. Anyone who has registered is entitled to take part. But you may have to submit a written statement in advance which the panel may question you on.

7. Decision stage

After 6 months the examination closes. The Examining Authority then has three months to report and make a recommendation to the Secretary of State. The report is not made public at this stage.

After a further three months, the Secretary of State must make a decision and publish the report. (Exceptionally the Secretary of State may give him or herself permission to extend this deadline).


If the examination for the A303 at Stonehenge proceeds on a similar timeline to other projects (see ‘overview’ section below), then we can anticipate the key dates roughly as follows:

Date Stage in process
19 October 2018 Application received by the Planning Inspectorate
16 November 2018 Accepted for examination
9 December 2018 Registration of interested parties begins
11 January 2019 Registration of interested parties closes
25 January 2019 Relevant representations published on the website, draft examination timetable issued
Early Feb – early March 2019? Preliminary Meeting takes place; Examination begins
Early Feb – early March through to? Examination process including questions, written representations, comments on these, Accompanied Site Inspection, Issue Specific Hearings, Open Floor Hearings.
August – September 2019? Examination closes
February – March 2020? Secretary of State’s decision


Under the Planning Act 2008 a separate system was set up for Nationally Significant Infrastructure Projects. Its purpose was to speed up decisions and give developers more certainty.

It is a radical departure from the Town and Country planning system. It curtails the rights of the public to take part and be heard, and compresses the decision-making process into a set timescale laid down in the act and regulations.

How does the NSIP process differ from an ordinary planning application?

Town and Country Planning Major Infrastructure Planning
Town and Country Planning Acts Planning Act 2008
Pre-application consultation not usually required Statutory requirement for developer to consult before the application is made. The consultation is run and paid for by the developer.
Developer applies to local council for planning permission Developer applies to Planning Inspectorate (National Infrastructure Planning) for a Development Consent Order
Council runs a consultation Inspectorate decides whether or not to accept the application (on process, not merit)
Set time for comments and objections Set time for comments and objections
Council decides application within time limit Planning Inspectorate holds Examination with 6 month time limit. No right to take part if you have not registered. Limited right to be heard. No right to bring expert witnesses or cross-examine.
Application is tested against Local Plan and NPPF Application is tested against National Policy Statement which you can’t challenge. Can be overruled by site-specific considerations “where adverse impacts outweigh benefits”
If refused, developer can appeal Planning Inspectorate (Examining Authority) has three months to make recommendation
Planning Inspectorate holds written appeal or public inquiry Relevant Secretary of State decides (depending on the project – eg for a road it will be the SoS for Transport)
Minister decides Option of Judicial Review
Option of Judicial Review

The 2008 Planning Act generally removes the right to question the need for a project. This is assumed to have been established by Ministers (subject to Parliamentary scrutiny) in a series of National Policy Statements (NPS). The purpose of the examination procedure is to determine whether or not the various provisions in the NPS have been correctly applied. Projects can be rejected if the examiners – and ultimately the Secretary of State – consider that the local adverse impacts outweigh the benefits. This does not often happen! Around 94% of projects that are accepted for examination by the Planning Inspectorate succeed in gaining a Development Consent Order.

Who examines the application?

The Planning Inspectorate appoint a panel – one, two, three or exceptionally more qualified planning professionals. Collectively they are known as the Examining Authority.

The Examining Authority may be assisted by an appointed expert assessor where an application raises issues of a specialist nature which are beyond the normal remit of a planning professional (knowledge of the World Heritage Convention for example?)

The Examining Authority conducts the examination throughout, writes a report and makes a recommendation to the Secretary of State. The final decision rests with the Secretary of State.

How do the local planning system and the local authority fit in?

These are relegated to a lower status. If there’s a conflict with local plan then this can be considered as a factor against the project, but the Secretary of State is likely to give more weight to the National Policy Statement.

The local authority will be formally consulted, and asked to input at various stages. They will be asked if they think local consultation has been adequate. For the project itself they have the opportunity to submit a Local Impact Report. It’s worth liaising with the local authority planning officers or others (such as ecologists) but bear in mind that because the local authority does not take the decision they may not give very high priority to getting involved in a NSIP in their area.


There is a lot of helpful guidance on the Planning Inspectorate website – this video  is a useful and illuminating guide to the process

See also Advice Note 8 for an overview of the process

Planning Act 2008: examination of applications for development consent

The Infrastructure Planning (Examination Procedure) Rules 2010

Planning Act 2008

National Networks National Policy Statement


NSIP – a Nationally Significant Infrastructure Project

PINS – the Planning Inspectorate

DCO – Development Consent Order

NPS – National Policy Statement

EA – the Examining Authority


The developer does not always win! See “Extinguished” – short video about the successful campaign to defeat a proposed incinerator near Merthyr Tydfil.e


As an indication of the possible timelines for the Stonehenge A303 examination, here’s a simplified timeline for a project that has completed its examination – the Silvertown road tunnel, promoted by Transport for London. Several details have been left out for clarity, including hearings and submissions relating to compulsory purchase.

Date Stage in process
3 May 2016 Application received by the Planning Inspectorate
31 May 2016 Accepted for examination
13 July 2016 Registration of interested parties begins
31 August 2016 Registration of interested parties closes
06 September 2016 Relevant representations published on the website
13 September 2016 Notification of Preliminary Meeting, draft Examination Timetable and Initial Assessment of Principal Issues published
05 October 2016 Agendas for the Issue Specific Hearing on the Draft Development Consent Order and Open Floor Hearings published
11 October 2016 Preliminary Meeting takes place; Examination begins
18 October 2016 Examination timetable, First Written Questions, Notification of hearings and Accompanied Site Inspection (ASI) sent
15 November 2016 Deadline 1 for: Written representations; comments on Relevant Representations; responses to Examining Authority’s First Written Questions; Local Impact Reports
06 December 2016 Accompanied Site Inspection; Issue Specific Hearing on Traffic/Transport Modelling
14 December 2016 Deadline 2 for: Comments on Written Responses; Comments on Local Impact Reports; Comments on responses to First Written Questions
17 January 2017 Issue Specific Hearing on Traffic/Transport Modelling, Forecasting and User Charging and Economic Issues
18 January 2017 Issue Specific Hearing on Air Quality, Noise, Other Environmental Issues
19 January 2017 Issue Specific Hearing on the draft Development Consent Order
27 January 2017 Deadline 3 for: Post-hearing submissions including written submissions of oral case;
10 February 2017 Second Written Questions, and notification of further hearings issued
06 March 2017 Deadline 4 for: Responses to Second Written Questions
20 March 2017 Deadline 5 for: Comments on responses to Second Written Questions. Report on the Implications for European Sites published
28 March 2017 Issue Specific Hearing on any other outstanding issues including Environmental Matters; Open Floor Hearing
29 March 2017 Issue Specific Hearing on the draft Development Consent Order, and Other Matters of Legal Drafting
05 April 2017 Deadline 6 for: Comments on the Report on the Implications for European Sites
11 April 2017 Examination closed

Author’s note

I have done my best to ensure the accuracy of this briefing, my apologies for any errors. Please bring them to my attention if you see them and I will amend.

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