London is often claimed to be the greatest city in Europe and one of a handful of global megacities. It has been called ‘the cultural capital of the world’, and represents a huge soft power asset for the UK. Post-Brexit, it will have to fight hard to maintain this status whilst also working with the rest of the country. But successfully doing so will be vital for the nation as a whole. 

https://www.britishcouncil.org/organisation/policy-insight-research/insight/all-that-mighty-heart