Regarding alternatives:
The SDP are planning to field quite a lot of candidates according to their website. I'm not sure I like all their policies but I'll certainly check them out.
There will hopefully be a well regarded local independent candidate although they're not declared yet whether they'll definitely stand.
At the moment, I favour an independent. I like the idea of someone who isn't tied to a party line and who has to answer to their neighbours rather than to a party whip.
And no, I don't expect either to come anywhere close to winning but I don't regard picking a winner as the main point of voting. In any case, by picking up votes, including my own, they could definitely do some damage to the favoured candidate.
I'll still wait until I've read the Labour manifesto before I decide. In fact they'll have until polling day to change my mind. There's still time but I've gone way past the pleading and hoping stage.