I feel really sorry for you, you clearly worked hard to get the rig and now a stupid memory incompatibility is stopping you from enjoying your monster PC. I hope you are able to get it sorted soon.
I think you will need to contact OCUK on monday, I don't think they are open on Sundays. If you told them your problem and directed them to this thread they will hopefully allow you to exchange your RAM for that Kingston stuff, and just pay the excess cost + shipping.
Don't feel sorry mate, because as they say, every cloud has a silver lining.
the way I see it is:
I just started summer holidays, so i've got 8 weeks to get this fixed,
The next time a new PC builder encounters this problem, he will get to avoid all the hassle of testing,
I'll have learnt a lot about my computer in the process,
it will get sorted eventually, and I originally meant to spend 2 days on this build, but I ended up doing it in 5-6 hours, so it's not as if i'm losing time,
and lastly, as Thomas Edison said when he was told to give up:
I have not failed a thousand times, merely learnt one thousand ways not to build the light bulb.
only, i've done slightly less than 1000 attempts!