London is a port city, and Britain became great because of its navy and ability to trade across the globe. The capital’s wealth is built upon that sea trade. There are reminders of London's maritime history everywhere. In Trafalgar Square, we commemorate the 1805 victory (and the death) of Admiral Lord Nelson at the Battle of Trafalgar. At Tower Hill, we remember the 36,000 merchant mariners lost at sea with no known grave. And the Museum of London Docklands examines the triangular trade in goods, sugar and slaves, upon which so much of the city’s wealth was built.

This autumn the British Museum, in partnership with National Museums Scotland, will stage the first British exhibition in 40 years on the Celts. Celts: Art And Identity opens at the British Museum on 24 September and will draw on the latest research from Britain, Ireland and Western Europe.