Does anyone know what this is? It seems to be a British patent.

That's a token used on a supermarket trolley; It means the size of pound sterling copper plate, and other European countries mainly use 1 euro or 0.5 euro. You can view luggage case coins, coin key chains and other pictures. You can know that after the tokens are taken out, they can be put into the coin slot of the cart, and the cart can be rented smoothly, which saves the inconvenience of finding coins temporarily.