I have only ever seen £50 notes in photos!
As for cash and 'what is the world coming to'...
I used to collect loose change in a huge jar. I'd wait until I had about £30 worth then count it out into coin bags and cash it in. These days, I do so few transactions in cash that I will probably never fill the jar again! I was wondering what to do with the coins that I had already collected and then I had an idea - I put about £1.50 in 1ps, 2ps and 5ps into each of multiple coin bags and always carry one bag with me when I go shopping. If there is a good busker playing on my route I donate the bag of coins to them.