So, I've been trying for the past 20 minutes to look at overclockers.co.uk which is the company/website I use to buy my hardware, and there seems to be some kind of problem!
It is working for me too, Ireland in a mobile if that counts for anything. Could it be the local connection form them to you is having problems rather than their website.
Overclockers website has always been a bit clunky, it often loads slow too.
Overclockers are not what they used to be, their prices are usually more than everyone else and their deliveries look like someone has played football with them.
Others to check out are scan.co.uk and ebuyer sometimes has items far cheaper and amazon often beats out the others especially with free delivery where as ocuk will cost more than average.
Here's the condition of my last order with overclockers.co.uk
1 x damaged case (looks like some attacked it with a sword)
1 x bent backplate on an unboxed graphics card (gtx980), no box! wtf, ye like that was brand new and not refurbished or an rma
GTX980 was wrapped like this in a box with a PSU sliding about in it: