Where to buy real branded Ritek G04 4x discs in U.K?

I was going to buy these quality Ritek dvd’s from http://www.digitalpromo.co.uk but they say that it out of stock and that the will not sell 4x discs anymore. The price was 15 £ for a pack of 50. Does anyone know a U.K based company that still sell these discs at a similar price?

TraxData is also an official brand of Ritek.
Get some TraxData brand discs.
Most recommended UK shop = SVP.

SVP doesn’t seem to have those Traxdata discs though.