London is a torrid ****-hole of a city where every dumb city boy and tourist gravitate to, not to mention the people who choose to live and commence with their lives there.
What is there outside of London?
Everything!
You have two thousand years of history existing outside of Londinium; from Wales to the Fens, to the Midlands and the Moors up through ter' tha' North where pies are made proper and chips come swimming in gravy. Anyone who visits London and claims to have seen the United Kingdom (or even 'visited') are fooling themselves out of the rest of this land.
Spend your day there if you really need to but get out fast, London is the most expensive place in the United Kingdom. Visit York, Nottingham and Sherwood Forest, Cardiff and Wales (not to mention the 12349094 castles!), the old Danelaw, the Humber and Cumbria, Leeds (for the Royal Armouries!) and Skegness - then there's Scotland and Edinburgh, Glasgow and Perth, Stirling and Shetland and every other place!