Thanks for your replies chaps.
I have the MEC Free Position on my Panther at the mo. It has a two piece backplate on it and I am getting around the problem by removing the thicker of the two peices and screwing the thinner one directly to the butt.
I works but it can't be doing the woodwork any good every time I swop it over, that's why I was looking for a better fix.
Thanks alan-aitch, methinks that will be the solution, not sure why I didn't spot that item. Looks like I will be going down the Anschutz path, better save me pennies up,
Buttplate Adaptor £40
Buttplate Carrier for Anschutz Precise £100
Anschutz Precise Slim Buttplate with Hook 5012 £200