Your interest in sensible policy rules out UKIP (whose policies are increasingly batshit) and the Brexit Party (who lack any kind of stated policy at all other than the one their name implies). The Conservatives may not be as unequivocally pro-Leave as these parties - Theresa May was a Remainer during the referendum campaign - but they are at least prepared to talk to continental Europeans and try to organise a withdrawal agreement.

If voting Conservative sounds like a hideous and disgusting prospect to you, then you may be among those who favour Brexit on the left. If so, you will probably prefer to elect somebody from the LABOUR PARTY - but be prepared for the high chance that the MEP you elect will not share your Leave stance.