5. The authorised development must be undertaken in accordance with the code of construction practice, or with such changes to that document as agreed by the relevant planning authority, provided that any such changes must—
(a)be in accordance with the principles set out in the code of construction practice;
(b)be necessary or desirable to reflect a change or update in legislation, guidance or good practice or confined to a specific location along the route of the authorised development,
(c)not give rise to any materially new or materially different environmental effects to those assessed in the environmental statement; and
(d)not result in a variation to the measures set out in the HRA Commitments Schedule.