According to The World Fact Book UK employment is divided: agriculture 1%, industry 19%, services 80% .I have some sympathy for your position, but to invent figures off the top of your head (400 000 probably means 750 000, it's all the fault of 200 MPs etc) only serve to weaken your case
Depending on how you define 'city' and 'country' then you may come up with diffent figures