Thanks andrew
Have just rang a mate of mine,his reply to this was:
dig trench 5m from building,dig 1.5m2 hole,sub structure to base,(concrete) insert drainrings (WTF)are they?,backfill with pea shingle,cover plate to top, trench to filled with pipe and pea shingle,topsoil then turf,
there ya go, when you start digging it dont call me iwill be busy, see ya.
SOME MATE HE IS?