"As long as you achieved the skill it was fine, form didn't really matter."
I'm afraid that can sometimes be the case with the learn to skate programs run in the UK, but a lot depends on the coach.
Roller rinks I've been to:
Rollerworld Derby - Decent enough - lots of kids on the midweek night I was there but super cheap
Skateland Nottingham - A bit on the small side but polished concrete floor is super fast, really cool vibe on the adults only night I was there
Curve Motion Bury St Edmunds - no complaints, good over-16s session on Wednesday mornings
Madison Heights Maldon Essex - big, quiet when I went
Roller City Welwyn - a bit on the small side but the Friday night session is great fun
Flippers Westfield Shepherds Bush - expensive, busy, more like a nightclub with a rink in it, but maybe worth one visit