DISUNITED FASCIST NATIONAL INTERESTS
We are in this shithole precisely because of the City of London. They may well be 10% of the national economy, but so what? We don't need them. They need us!
The City of London has no national interest other than screwing us for every penny it can, and then killing us, either through schemes like the Liverpool Care Pathway or savage austerity or state sponsored terrorism or war or measures to protect us from made up fantasy global warming or whatever we fall for.
Ask yourself why it is called The City of London. It is because it considers itself separate from the UK. It is an independent entity.