Decent tire shop W-SW London?

[rosino]

I think I have a slow puncture to the front right tire on my 991s. Drops approximately 0.2 bars per week.

Recently OPC took tires off to respray alloy in dark grey, that might be why if tire not refitted properly? Just trying to find a place where they can take an honest look and potentially repair it if possible. Was thinking kwikfit sloane avenue but not sure they are really ok for a new car with TPMS etc?

Any recommendations welcome.