In reply to Stuck On a Wall:
Yes, it's totally fine going bouldering by yourself (perhaps not quite as fun) - but choose your venue carefully.
Almscliff is a good choice as there are lots of low problems with good landings, and loads of people to meet at the crag. As you say, just bring a pad and you may well find folk to team up with anyhow. Shipley Glen would be a less good choice as it's rather more dangerous. But since the Glen is dead easy to get to by public transport it don't write it off as there are suitable bits in amongst the high, scary stuff. Caley has a good mixture unsuitable (high, scary) stuff and nice low stuff that's fine on your own. Caley is great in the spring and can be crap (sweaty, midgey, overgrown) the rest of the year.
The bouldering in Yorkshire is some of the best anywhere - get stuck in!