It's a shame OCUK can't arrange something with DX Racer. I did ask about this myself some time ago and was told that it was unlikely to happen.
I have the DX Racer M-Series which I bought after cancelling my pre-order for one of the AK Racing chairs. After seeing the issues others had I decided not to buy the AK. The DX Racer M-series is really great, not one single problem with it and I've had it for about a month now. It's very comfortable, looks great, all the parts are well made and the stitching and material is great quality and done right.
Anyone considering buying one, I think can be confident they will get what they pay for. They were great to deal with by email and delivery was very quick once stock was available. It took 4 days to get to me from Poland. You might have to wait a while until they get more stock but the ETA they had on their website when I bought mine was the exact date they got the stock and they shipped out to me the same day.
You have to inspect it before signing for it when delivered and if there are any defects at all you have to sign as faulty/damaged etc and they will replace it or at least replace parts that are defective. The box they come in is strong triple wall cardboard and they are well packed inside too. Took me less than 10 minutes to put mine together on my own and everything fitted together perfectly.