i took 'paper' 20 quid note from i think 2015 to an exchange here in this asian country to turn it into $ and was told no 'sir' we dont take this note anymore,

i took 'paper' 20 quid note from i think 2015 to an exchange here in this asian country to turn it into $ and was told no 'sir' we dont take this note anymore, only 'plastic' 20 quid note. my 20 quid note was valueless right here. of course i suppose i could go back to london and exchange it for a plastic 20 quid note. just saying.