Greater London, not the City of London
What's the difference?
We have the Lord Mayor and the Mayor, the Lord Mayor being mayor of the City of London and the Mayor being the mayor of London which is all of London around the City of London. The City of London and Westminster used to be two rival cities, but then they fused and just became one big London, but the City of London retained its rights in the Magna Carta (hence why the government is in Westminster, not the City of London). Oh yeah and 50 years ago the Westminster borough was awarded city status again, so London is technically 3 cities.
The City of London is basically pure, distilled shekel magic: finance, broking, insurance, legal, fund managers, banking and tech startups. Greater London is more diversified into everything. Whilst Greater London is more powerful and wealthier than the City of London, the City of London reserves certain powers and is probably wealthier than any two of the financial centres in Greater London combined, depending on how you measure it - so it's still pretty powerful. Oh yeah, and the City of London is a democracy ran by businesses (by Livery Companies, think evolved guilds, where the guilds are basically representations of the associated businesses), I think it might be the only one in the world where that is de jure the case.
There are Livery Companies of:
Mercers (general merchants), Grocers (spice merchants), Drapers (wool and cloth merchants), Fishmongers, Goldsmiths (bullion dealers), Skinners* (fur traders), Merchant Taylors* (tailors), Haberdashers (clothiers in sewn and fine materials, eg. silk & velvet), Salters (traders of salts and chemicals), Ironmongers, Vintners (wine merchants), Clothworkers, Dyers, Brewers, Leathersellers, Pewterers (pewter and metal manufacturers), Barbers (incl. surgeons and dentists, since people used to have surgery/dentistry by the most experienced human cutters... Barbers), Cutlers (knife, sword and utensil makers), Bakers, Wax Chandlers (wax candle makers), Tallow Chandlers (tallow candle makers), Armourers and Brasiers (armour makers and brass workers), Girdlers (belt and girdle makers), Butchers, Saddlers, Carpenters, Cordwainers (fine leather workers and shoemakers), Painter-Stainers, Curriers (leather dressers and tanners), Masons (stonemasons), Plumbers, Innholders (tavern keepers), Founders (metal casters and melters), Poulters (poulterers), Cooks, Coopers (barrel and cask makers), Tylers and Bricklayers (builders), Bowyers (long-bow makers), Fletchers (arrow makers), Blacksmiths, Joiners and Ceilers (wood craftsmen), Weavers, Woolmen, Scriveners (court scribes and notaries public), Fruiterers, Plaisterers (plasterers), Stationers and Newspaper Makers (journalists and publishers), Broderers (embroiderers), Upholders (upholsterers), Musicians, Turners (lathe operators), Basketmakers, Glaziers and Painters of Glass, Horners (horn workers and plasticians), Farriers (horseshoe makers and horse veterinarians), Paviors (road and highway pavers), Loriners (equestrian bit, bridle and spur suppliers), Apothecaries (physicians and pharmacists), Shipwrights (shipbuilders and maritime professionals), Spectacle Makers, Clockmakers, Glovers, Feltmakers (hat makers), Framework Knitters, Needlemakers, Gardeners, Tin Plate Workers, Wheelwrights, Distillers, Pattenmakers (wooden-shoe makers), Glass Sellers, Coachmakers and Coach Harness Makers (now for cars), Gunmakers, Gold and Silver Wyre Drawers (threadmakers for military and society clothing), Makers of Playing Cards, Fanmakers, Carmen (vehicle drivers), Master Mariners, City of London Solicitors' Company (lawyers), Farmers, Air Pilots, Tobacco Pipe Makers and Tobacco Blenders, Furniture Makers, Scientific Instrument Makers, Chartered Surveyors, Chartered Accountants in England and Wales, Chartered Secretaries and Administrators, Builders Merchants, Launderers, Marketors, Actuaries, Insurers, Arbitrators, Engineers, Fuellers, Lightmongers (electric lighting suppliers), Environmental Cleaners, Chartered Architects, Constructors, Information Technologists, World Traders, Water Conservators, Firefighters, Hackney Carriage Drivers (licensed taxicab drivers), Management Consultants, International Bankers, Tax Advisers, Security Professionals, Educators and Arts Scholars.
I believe every single trade known to mankind that is not illegal by British law is represented. My favourite are the wax workers because they contribute much to bee conservation <3
Also the Monarch has to ask permission to enter the City of London, as in the past the Merchants were always worried about the Monarch walking in with a load of troops and then taxing the shit out of their wool. Nowadays this is not so much a fear, as the Queen has enough wool.