It's not bad, in terms of an annual salary. Certainly in the Midlands/North it's a decent amount to start off on, and as you go up the payscale you can live quite comfortably.
I was on M1 last year, went up to M2 in the Autumn term and have just gone up to M4 after applying for pay progression.
My partner is out of work, so I pay for all the rent, food, transport costs etc., and we still do OK. We can afford cheap holidays, meals out, new clothes etc. - not constantly, but we do have treats. Now I've had a pay rise I'm hoping to put more money in my savings.
What is bad is the workload in relation to the pay. But I don't think more money is the solution. Ultimately, the reason my money goes a long way is that I don't have time to go out spending very often. They need to do something about teachers' workload, not throw money at the problem.