It's interesting. There's a few bitxxxxx.co.uk results in google.
They're all selling bitcoins for GBP and I feel your name is better than theirs. If you can circumnavigate all the red tape and figure out those guys business model/setup you could develop and go in to competition with them. I'd want to look in to possible TM's thoroughly before going down that route.
There are some previous sales of similar names in .co.uk and they seem to go for $1-3k. Perhaps it's wise to note that all the action was in 2011-2013, when bitcoins were hotter than they are now.
Sorry for the long reply- I hope it helps.