Why was the £20 note changed?

Question

What was wrong with the old ones? and why wasnt the £5 and £10 notes changed as well?

Answer 1

risk of forgeries,   Not the same problems with 5 and 10  and  probab;ly not worth doing.   Also     note that  no one takes £50 notes any more,   Might as well scrap them

Answer 2

In case you have a load hidden under the mattress or floorboards.x

Answer 3

All are changed periodically but not at the same time.  It helps defeat counterfeiters. Each design has numerous anti-counterfeiting components.

Answer 4

in ireland you cant get £5 notes out from the bank i think that sucks