The last one is a coronation medal for the city of northampton. Maybe it was presented by the mayor to Scotland yard. Maybe that is someones name.
The Middle is a piece of something, the top should probably read Duke of Edinburgh, I can't decide if I think it is a shop sign, A token for shopping discount for duke of edinburgh award winners or something else.
I've located a similar medallion on the internet: https://www.whitmorectm.com/product...gilt-brass-1 These gilt medallions were issued by the corporations or town councils of numerous British towns and cities on the occasion of a coronation, and distributed to local schoolchildren or perhaps to employees of the Corporation.
Quote: The top one reminds me of one of those bracteate pfennigs from an early German city state - but they are normally in silver (if in low grade)
That's an interesting idea, the hand is similar to Heller coins, and that could be a Stylized P F, though I am inclined to think its a BF. All the ones I could find though are squares made into circles, not the other way round.