Obsolete notes can be redeemed at tha Bank of England forever.
We don’t print money every day like you do
When it wears out they replace it with a new design and new security.
Only something like 1 in 100,000 UK bank notes is a forgery. I think your ratio is 10 times that.
Most people here don’t even use cash any more so we have to find tourists to dump the old notes on to
.