The coin was first issued on April 21, 1983, as it was felt that a coin would be more useful than the less robust £1 note amid the decline in its spending power and the growth of the vending industry.
A note lasted for just nine months on average, while a £1 coin, with its distinctive yellow "brassy" colour, can survive for upwards of 40 years.
The reverse designs of the £1 coin represent the UK and its four constituent parts - Scotland, Wales, Northern Ireland and England and the first series of designs took floral emblems as its theme.
More top news
Tuesday's weather forecast with Simon Parkin
Monday night's weather with Simon Parkin
Monday afternoon's weather with Simon Parkin