The former interim director of London’s British Museum, Sir Mark Jones, believes foreign visitors to the UK’s museums and galleries should pay a £20 entrance fee. If adopted, the move would end the UK’s long-standing tradition of allowing everyone free access to its public galleries, regardless of their nationality. UK galleries, however, do set an entrance fee for all visitors to specialist exhibitions or blockbuster shows. As it stands, the UK is an outlier when it comes to charging. In France, Greece, across Europe and the United States, visitors face paying a charge to enter their major cu…