Hi Joe,
I know a lot of people are offering the "go around and ask" at the clubs/pilots/syndacates route but as you'll find out most of them have already been mined dry.
The other option is too look into getting more money. I know people here may jump down my throat but if you can swim have a look at getting your NPLQ (lifeguarding) qualification. On average you are looking closer to £7.00 an hour as opposed to bar work which is around £6.00. Also with the better hours you'll do in the swimming pool, ok you'll lose some weekends but a little bit of planning will leave you loads of time to fly, you should also have time to look at doing your swimming teaching qualification which can be around £10.00 an hour.
And that's more than some instructors make!
Anyway you include extra time and paid holidays with lifegaurding (or something similar) then you may be able to afford three houurs of flying a month as opposed to two.
Good Luck