The 'silver' UK coins, (5p, 10p, 20p and 50p) are made from an alloy called Cupro-nickel - typically 75% copper, 25% nickel and a trace amount of Manganese.
Because silver is far too expensive. Coins used to contain silver until about 1920 in the UK, 1965 in the U.S., and 1968 in Canada. Since then they are made from a mixture of copper and nickel, so...
All British circulating "silver" coins since 1947 have been made from a copper/nickel alloy.No circulating British decimal coin contains any precious metal.
No circulating British decimal coin contains any silver at all. The closest you might have got, prior to 1920, to a pure silver circulating coin was 92.5% (sterling silver), the standard at the time....
1p & 2p coins are made of copper-plated steel. 5p 20p & 50p coins are made of copper-nickel. £1 coins are made of brass. £2 are brass on the outer ring and nickel on the inner portion
Silver became too expensive to make coins from, for many countries, during the 20th Century.
Low denomination coins are traditionally made from copper, but copper has also become too expensive and...