Even if your party isn't likely to win in your area it's still worth going out and voting. If nothing else, if everyone who wanted to vote for someone else in a so-called "safe seat" actually went out and voted that "safe seat" might not be so safe, and if the gap closed then more people are liekly to got out and vote for the 2nd or 3rd place party in the next election as it'd be more likely they could topple the leading party.
In any case, you (Brits) have the opportunity to vote today. Whether you are voting for a local candidate on his/her track record over the last four years or voting because of the National Parties views/record of the last four years it is your vote and as equally as valid as anyone elses. Please try and use it.
It should be an interesting one. See ya' laters!