Swimming

My 2 local leisure centres both have a contract with swimming nature who are unaffordable for me.
I'm also looking to improve my technique, i'm fine for short sprints but can't crawl for any serious length of time. I've been swimming 4 times a week for the last month or so, to recover from an ankle injury sustained earlier. Whilst I really enjoy the workout I get backaches every time I swim.

Is a group of adults tuition lesson too expensive aswell ?
I really would suggest a qualified asa teacher. Like rhb mentioned, your local swimming pool ?

I wonder how much work i could get off this site if i qualified ?
Ive been thinking about it for a year or so now.