In reply to supafly:
In reply to supafly: I think I plateaued at around V3/4 for a while. Didn't really do anything specific to improve, just got a lot more mileage and now I'm stronger and have better technique.
My take on it is that when people start climbing they have different levels of natural/existing ability, and the more ability they have, the more grades they progress through quickly before hitting a plateaux. I got better quite quickly up to V3/4, then much more slowly up to V6. I'm not really that keen on bouldering (prefer routes) so I've never trained or anything other than going to a bouldering wall and bouldering on grit (and on holiday).
By the way, what sort of bouldering are you doing? To get better at grit, climb lots of grit. Go to Font for harsh lessons in just about every area of technique you can think of (and how to manage tendonitis). Boulder on limestone to get really strong fingers. Do the lot, and you'll get a lot better.
For climbing indoors, I'd probably recommend changing your tack at the wall and doing a high volume up to V2/3 for a while, so you're learning more technique rather than training strength (you won't lose any strength since V3 is still pretty demanding). It's also good just to do something different when frustrated. When you've done about 2000 V3s (number totally plucked from thin air), V3 should feel easy, V4 a bit stiffer and V5 you'll be able to work. Once you're working V5s and climbing them well, V6 will be in reach. Then it might be time to start fingerboarding and stuff, cause you'll have the technique to make good use of extra gains in strength.
In my experience, 1h isn't very long to spend at a bouldering wall. Sessions of 2-3h a time might help matters drastically.
That's my ideas of how to progress (slowly, with minimal effort). If you really want to get better fast, I guess read a load of training stuff, diet, blah blah. But I don't reckon that's as useful in the long run as doing loads of climbing of different types and developing technique.