The no gas rule is mainly because at festivals like Leeds tha last night is a warzone with people getting seriously injured by idiots throwing them on bonfires. And however semsible you may be, nowt stopping someone taking your gas stove and throwing it on the neaest fire for a ‘laugh’.
Clas Ohlson do a trangia rip-off for about £20. I’ve got a ‘real’ one which is better in a few ways, but not £30 better unless you use it a lot.
Same goes with those “no beer to be taken into stage area’s” rules, I believe they cannot legally pat you down.
True, but their festival their rules. If you don’t accept being searched then they can refuse you entry, the tickets will have R.O.A.R or similar on them.