Porsche Mechanic in London?

[Younez]

I have modded 991 Turbo S and need to take it to service soon, I am very fussy about this car. I am looking to take it somewhere where the mechanics know their stuff and take extra care. Can anyone recommend someone at an OPC or at an indy ideally in London area. I have already visited 9e, Parr, JZM and Fearnsport.