Help with slow puncture on 7.2 GT3

[SFO]

I have a slow puncture on one of my tyres.

OPC says that Porsche does not approve repair, only replacement. As I have non N rated Michelin Pilot Super Sport, OPC will only fit 4 new N rated tyres!

Any recommendations for non OPC place near London with the expertise and ability to deal with center locks and repair the tyre?

Thanks.

[gt3atlast]

Try RPM Technik 01296 663824, north of London at Long Marston. Really helpful and did all my tyres recently.