Got it in the post, plugged the one end into the PS3, the other into the television and BAM - nothing.
Well not exactly nothing. Television knew that something was there and switched to the appropriate channel upon turning the machine on, but television showed me nothing but a blank, blue screen, as with the other blank channels. The PS3 worked with the shipped cable on that television, so it can't be either of those, so the only logical conclusion is that either the cable doesn't work or I'm incorrectly plugging a cable into two sockets that I've plugged that I've plugged many a time before.
Shouldn't've gone for the cheap option