It's not an exchange (more of an escrow), and I've not used it but https://bitbargain.co.uk https://bitbargain.co.uk looks OK. They make the right noises regard

It's not an exchange (more of an escrow), and I've not used it but https://bitbargain.co.uk https://bitbargain.co.uk looks OK. They make the right noises regarding security and the prices seem reasonable.