My experience of buying from OcUK has been both good and bad.
First, the bad. I ordered an Antec PSU from them awhile back, which was DOA (tried on two PCs) - sent it back, but had to foot the bill (Â£10 or so). I wasn’t too impressed with having to pay to return a DOA item.
However…a few years prior to that, I ordered a case and some PC bits (mobo, CPU, RAM) from them, delivery was quick, everything worked as it should and the case lasted me through three different builds.