Re: Cashless society
"BTW, some of my cans of tuna have been in the cupboard for a while. If it has a BBE date of May 2017, at what point does it become unsafe to eat?"
Most canned items are good for much longer than the BBE date. If the can isn't bulged out and when you open it, it isn't a bit whiff, chances are that it's fine. I don't have a link, but there are some good guidelines online about what foods are safest to use past date and what the real world figures are for stored tins of different foods. I'd expect that if the tuna was off, it would be pretty obvious.