Here is something for you to watch and digest while I am away. My friend Antony sent me this 10-minute You Tube film that gives an easy to understand history of British currency since the time of Queen Victoria, to the modern day. It covers the change to decimal currency in 1971, and explains very clearly why all our coins are the size, shape, and colour they are.
If you are writing historical fiction, you may well find this to be a valuable resource.
And it also explains why I still use terms like ‘A quid’, ‘Ten bob’, and ‘Three half-crowns’.
And if you ever intend to visit Britain as a tourist, it will help you understand the coins in your pocket.