The UK Independence Party seems to be the conservative/libertarian option in the UK. They are in favor of tight border control, free markets and are adamantly opposed to the UK's European entanglements*.
They don't have any members in the UK Parliament but have a couple of seats in the European Parliament which they use to more or less harangue the Euro bureaucrats. Like this....
*I haven't run extensive checks on everything about the UKIP so I don't want to hear from the net nanny saying I've embraced evil or something. They seem alright and they certainly aren't the cretins from the BNP.