The Kew Gardens 50p is widely considered the holy grail of British coin collecting. Just 210,000 of these special coins were released into circulation back in 2009, making them the rarest 50p ...

Its 27.5mm diameter makes it the largest of any British coin, and allows space for decorative pictures. It has often been used to celebrate big events over the past 50 years of British history.

Its 27.5mm diameter makes it the largest of any British coin, and allows space for decorative pictures. It has often been used to celebrate big events over the past 50 years of British history.