舊版英鎊20 數問

想問下

1. 英鎊舊版20是否唔再流通?
2a. 如果唔再流通,我可否在香港既找換店或銀行兌換返港幣?
2b. 找換店或銀行通常會收幾多手續費?

先謝

1. 唔再
2a. Dont think so
2b. I had ten old-20-pound notes last yr. I just post it back to my UK branch and a week later, they deposited the 200 pound into the account for free.

要係番英國本土銀行換新紙.