[cassianoleal]

Great Britain, where London is located, is in Europe. As such, it remains European.

It is no part of the European Union but other countries in the continent are also not, without having ceased to be European.

America existed before the USA became a country and all countries within it haven't ceased to be in America or American either.

[dangerwill]

We're talking about industry here so political boundaries matter not the geographic definition of Europe. Trade restrictions are in place between the UK and the EU, and thus place a wedge between the two.