ISNT - it feels like your vote isn't worth it (know how you feel - I live in SW19!) but it absolutely is. You can rest assured that the politicians look at how many people have voted for the opposition, at every level.
I hate, hate, hate the idea of tactical voting because I hate not voting for the party I have chosen. But one of the advantages of living in an area where your choice has no chance of being selected is that at least you don't have to consider the tactical option! (cloud meets silver lining)
Off to Chinese now - will catch up properly later.