Food standards agency. I'd have thought they'd be experts on it.
Thats were you are going wrong!! Such people are typicaly too risk averse and lacking common sense. They are the sort of jobsworths who are going to lose their jobs in the great public sector clear out that is so long overdue. Use and sell by dates are irrelevant for most stuff for several weeks and longer for dried or tinned stuff.
Anyway, whats wrong with food poisening – its a super relaible way to lose weight.