German started WW1
Yes, they entered from the start as Great Britain
German invaded poland
By Nazi Germany invading Poland, and Britain's ally, France joining Britain in declaring war against Germany, which in turn led Japan to declare war against Britain and France, which then escalated the war from a pan European to Global (eventually).
3 September 1939: France and Britain declared war on Germany
There was no "Festival of Britain" Florin minted, you possibly refer to the "Festival of Britain" Crown (Five Shillings). See "What is the value of a 1951 British Crown - Festival of Britain".
Do you mean the Festival of Britain in 1951?
in britten Britain in 1951.
1951
The Festival of Britain was a national exhibition which opened in London and around Britain in May 1951. The official opening was on May 3.
The tradition goes back to the Roman Invasion of Britain. It was a merger of Roman tradition and Celtic traditional festival
1951
1951
what time does the may festival start
There is no documented evidence of a minting flaw in the "Festival of Britain" Crown, but it is possible. A reputable coin dealer will be able to advise.
4000 gbp
It was held in 1951