Try and get hold of a copy of 'Final Flights' - Ian McLachan pub PSL ISBN 1-85260-1221-1
I would strongly suggest not digging around in crash sites unless you know exactly what you're doing, i.e. ordnance disposal in the form of intact and potentially live 500 Kg german bombs !! military aircraft recovery is certainly tightly regulated by the RAF, they still own the airframe, and as for rummaging around in a designated war grave err... maybe you would want to think that one through again.
On the other hand there are a number of recognised preservation and recovery groups who would be very glad of the help. : )