Out of curiosity which Lib Dem policies don’t you like? In my view you’re never going to get the perfect politician/party that you 100% agree with all the time on every issue. In the end I still think it’s better to vote for the party/independent which you ultimately see doing more good in the long run than either to spoil your vote or stay home. Writing to your politicians is definitely a good thing – but again you’ve got more chance of swaying someone towards your views if they’re a liberal and you’re a liberal rather than if they’re a conservative and you’re a liberal. I know it’s a bit more complicated than that, but I think it helps if you’re at least on the same page on the basics.