Article 4 Power to deviate
Subject to paragraphs (2) and (3), the scheduled works must be constructed—
in the lines or situations shown on the works and land plans;
in accordance with the levels shown on the sections; and
in the case of any building for which an upper limit is shown on the works and land plans, within the limit so shown.
In constructing or maintaining the scheduled works, the promoter may—
deviate laterally from the lines or situations shown on the works and land plans to any extent within the limits of deviation; and
deviate vertically from the levels shown on the sections—
to any extent upwards not exceeding 3 metres; or
to any extent downwards as may be found to be necessary or convenient.
In the case of any building for which an upper limit is shown on the sections, the power of deviation under paragraph (2) is subject to the limit so shown.