BV, once again, good point, well made.
20 people turning up with a photocopy of the single bill for supper ain't going to be accepted. It will always come back to the argument of, "but I didn't have the onion bahjis or the cucumber rhaita!" Or, in reality, who had what, who spent what.
When it all gets too difficult, the system just needs to be "reasonable".
Folk on detachment don't have time to do the admins' jobs for them. And that is why I said that people are normally more pissed off with a difficult, seemingly unsupportive system than with the rates themselves. Sorry, "allowances" themselves.