The UK is more enlightened than the US so you don't have to worry that a 0 feedback girl will be a police sting.
You should, however, worry that it would be a fake profile, bait and switch or terrible punt.
There are plenty girls with feedback that you must have to really want to see the 0 feedbacker in order to risk it. Might be good, might be bad, it's a roll of the dice - having said that they do all have to start off with 0 feedback. Many factors to consider.
You can always post it here and ask for opinions as and when you find one that you are interested in.