Nominet describe the renewal process here [nominet.org.uk].
The current owner should still be able to renew the name - have you tried contacting them?
I hate to get into threads endorsing the reputation of service providers . . BUT . . . maybe on this topic . . maybe just this one time we can . . .
Being a mod here is such a cake walk, ya know? Anything goes . . . :P
Sometimes you just have to plow through your fears. I was able to secure quite a few domains by directly contacting the registrants of expiring domains. Succeeded about 4 in10 times average, which at the time was a far better success rate than I would have achieved playing the drop-catching game. Good karma, too, as I always prefaced my communication by asking "Are you aware that your domain name has recently expired?" 50% weren't an thanked me. 40% were and often said something like "You can have it" and the other 10% simply were not reachable. (Rough averages here.)