If you have these coins, that have rare errors or dates, you could net yourself a small fortune - here's what to look out for ...

Of all the coins created to commemorate the 2012 Olympic Games, the 50p Football is among the rarest. It features an explanation of the controversial offside rule on it, with 1,125,000 produced.

AN ULTRA-rare coin has sold for a price 10 thousand times its original face value - and it has one key detail. The "extremely rare" 50p coin is ... addition to any collection and a perfect ...