Dano, please put your rolleyes away. It really isn't doing you any favours.
A biometric record for a fingerprint is a sequence of numbers that represent key features of your fingerprint. It is not a photograph, and it cannot be 'reverse-engineered' to make a fingerprint.
If you're worried about identity theft, then you have a big problem. Your employer holds your name, address, date of birth, possibly your phone number, NI number, bank account details. That's a wet dream for a criminal wanting to steal your identity - everything that matters about you in one neat package. Your fingerprint doesn't even come close to making an iota of difference to a criminal armed with that lot.
My advice: Quit being paranoid or leave. That's the sum total of your options (unless of course you've got a friendly Union rep who can hold a strike ballot on your behalf). Good luck finding an employer who won't store enough data to steal your identity. Oh and don't bother claiming JSA either - they hold all the same data.
PS - I've had my credit cards cloned three times now. You'd expect me to be the sort of person to get paranoid. I don't - it's a fact of modern-day life.
Edit - forgot to say - as long as your employer complies with the DPA they can gather and use whatever data the law deems reasonable (and that would include biometric fingerprint data). You have no say in this matter.