Ive got some OEM equivalent Pagids which are Reg90 approved, they're the proper ones as well in the dark blue box instead of the EuroCarPart Light blue box rebranded stuff. Just high quality normal pads, if anybody wants em cheap get in touch.
DS2500 are not reg 90 but the sentiment over on SCN seems sensible.
The only performance pad that is Reg90 I believe is the RS4-2-1 Black pad from Pagid....Standard on a Carbon Equipped Veyron, Enzo and DBS. Its a soft pad designed to do maybe 15,000 miles prior to wearing out and to preserve the discs.
You may think pads for Carbon Discs are something special but in effect they are just very soft normal pads with a high temperature headroom, one of the lads on the TT forum put some RS4-2-1 into a porsche setup and couldn't get them to fade on track/ring/road...anywhere. They're well over 200 quid though
The true Carbon/Carbon setups on F1 & LMP cars are very different to the Carbon Silica setups on Supercars etc. Set of pads for 2 grand anybody?
I can get DS2500 for a GTI for 125 if it helps maybe a bit less actually