Yeah my stepdad used to work in "da" bank man

, thats the Royal bank of Scotland and he told me, and me not knowing any better belived him, perfectly reasonable if you think about it.
To make it legitimate, for every pound the bank prints a note for, the bank that prints it has to put in the equivalent amount ina deposite to the bank of England. so basically the Royal bank buys currency of the bank of England so they can print it in their own notes
Totally pointless