According to Government guidance:

‘A location plan should be based on an up-to-date map. The scale should typically be 1:1250 or 1:2500, but wherever possible the plan should be scaled to fit onto A4 or A3 size paper. A location plan should identify sufficient roads and/or buildings on land adjoining the application site to ensure that the exact location of the application site is clear. The application site should be edged clearly with a red line on the location plan. It should include all land necessary to carry out the proposed development (eg land required for access to the site from a public highway, visibility splays, landscaping, car parking and open areas around buildings). A blue line should be drawn around any other land owned by the applicant, close to or adjoining the application site.’

HM Government, link

This is set out in Section 7 of the Town and Country Planning (Development Management Procedure) (England) Order 2015:

an application for planning permission must... (c)except where the application is made pursuant to section 73 (determination of applications to develop land without conditions previously attached) or section 73A(2)(c) (planning permission for development already carried out) of the 1990 Act(1) or is an application of a kind referred to in article 20(1)(b) or (c), be accompanied, whether electronically or otherwise, by— (i)a plan which identifies the land to which the application relates; (ii)any other plans, drawings and information necessary to describe the development which is the subject of the application;

Any plans or drawings required to be provided by paragraph (1)(c)(i) or (ii) must be drawn to an identified scale and, in the case of plans, must show the direction of North.

Hedgerows are recorded as a centre line measurement along the length of the feature. Area habitats adjacent to hedgerows should be mapped to the centre line of the hedgerow (defined on OS maps by a black line).

9.2.1 - 2 Natural England, Biodiversity Metric 4.0 User Guide, link.

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