Decimal Day use pennies or threepenny pieces, to pay them in multiples of 6d (p, the lowest common multiple of the two systems). Bus companies (at that time many state-owned by the National Bus Company) were another exception, going decimal on Sunday 21 February. Decimal Day itself went smoothly. Criticisms included the small size of the new halfpenny coin and the fact that some traders had taken advantage of the transition to raise prices. Some used new pennies as sixpences in vending machines. After 15 February, shops continued to accept payment in old coins, but always issued change in new coins. The
Coins of the pound sterling (97%), the intrinsic value of pre-1992 1p and 2p coins increased with the surge in metal prices of the mid-2000s, until by 2006 the coins, would, if melted down, have been worth about 50% more than their face value. (To do this, however, would be illegal, and they would have had to be melted in huge quantities to achieve significant gain.) In subsequent years the price of copper fell considerably from these peaks. The following are commemorative issues and are seldom encountered in normal circulation due to their precious metal content. The following decimal coins have been withdrawn from circulation