Jay fray

Hi I am in the process of building a detached outbuilding built of brick and block with cavity wall construction The neighbour on one side has a burnt out disused shed still with a car in it and a lot of soil. All three of the elevations are problem free in terms of height of DPC however this side is giving me a problem. the problem is that their ground level is at the same height as my DPC If I move some of this Excess soil I can still see the concrete base for the shed and a concrete base for the shed is 150 mm Below my DPC which is perfect I don’t think that they will allow me to remove this eXcess soil therefore if I pushed it back into theOr garden how far do I need to push back so that building control are satisfied that the DPC will not be bridged