Now that the prices have been reduced on the 6700xt they don't present as unreasonable when compared to many other etailers in this country or the USA. The AIB partners will sell into whichever country they can make the highest profit margin on, so even if OCUK refused to buy cards from AIB partners on the basis of being so much over MRSP of the MBA, those cards would just be sold in another country such as the USA, let alone to another UK retailer.
Question for OCUK, if you make £25 profit on some cards have you considered approaching AMD to act as their agent in the UK for MBA cards, just as another retailer does for Nvidia. This would increase the profile of OCUK in the Uk further, plus you could talk with AMD about adding extra services to buyers of the cards, e.g. extra warranty as AMD only tends to give 2 years, the option for OCUK to build a system around the GPU being purchased.
I know that the OCUK system wouldn't cope with big orders so have a waiting list and when the MBA cards are available randomly select people on the waiting list to get a card, send them an email telling them that they have been selected and they have 24/48 hours to place an order, by website or over the phone depending on which is best for OCUK systems.