What does Britain’s role in the export of gunships to a Nigerian warlord tell us about the new Lib Dem leader – and about the British establishment’s attitude to its post-colonial, post-Brexit place in the world? The latest Liberal Democrat leadership contest was one of the least exciting votes of recent years. Vince Cable came first in a one-horse race. Despite the rather flat response he is already talking about making the party the second force in UK politics.