Depends how fussy you are about your cans! Im a snob, i'd turn my nose up at standard cooking lager, even if its free to be honest. I'd rather pay for something i know i like. But then i only have a couple of beers a day (and theyll tend to be 10% imperial stouts etc) rather than 4% lager necessitating more trips to the loo . . .
One thing I'll say is that either Dua Lipa or SZA will be at Reading next year, I'm 99% sure of that. I do think Dua Lipa would pull a crowd at Reading but she struggled shifting tickets at £60-70 a piece with bands announcing after her selling better easily at similar prices.