Thing is, I don't want to hammer the sh*t out of the financial sector - we can't force them to cut down over 3 years, more like 10.
And the other groups, to be frank, should be paying this as well because they are earning LOADS of money. We're talking about a country where the median household income is £24,000-odd pounds. The 50% only hits in over £150,000 - that doesn't even cover everyone in the top 1% of the population, which starts at £112,000.
I don't deny that the UK does very well from the oil industry as a whole, and really is a model for Britain, but my point with regards to the North Sea was that our economy became far too dependent on it. Our balance of trade would be disastrous without that.
The thing is, is that these companies won't really be driven away. Financial services are quite uncomplicated in the things they need in a place - they need low taxes, good international links and an attractive lifestyle. Other industries are more embedded into the economy, oil being a somewhat relevant example insofar as the technical side of the oil industry in Britain developed in response to the challenges of developing the North Sea. What is more, and the oil industry is a worse example for this compared to other sectors, a lot of industries use people who quite simply don't want to leave Britain.
You brought up the pre-Thatcher days when the top rate was 83% but the brain drain was at most an exaggerated trend. The vast majority of people stayed put - despite the fact that a British professor in 1980 earned less than a bus driver in New York City. This is also especially relevant because Britain, moreso than any other developed country I can think of, does have a cultural bias for emigration. A lot of the stories here have families being worried and such about family members moving abroad. But British families are inevitably supportive and there's a bit of an attitude of "Lucky you getting out of this dump".
Which brings up an entirely different point about how cynical Brits are about Britain, but anyway... Sort of lost the thread. The main point is, though, that the sort of industries which we need to encourage in Britain, which we need to shift to over the next 10-20 years, are the sort of industries which are far more embedded and contextualised than finance.
Essentially Britain needs to start competing with the rest of Europe and not the US. With our social system we can't beat the US in the industries which do depend on high rewards and high risk. And I think that our light-touch regulation in many aspects combined with a tendency for state organisation of consistent frameworks (if not mobilisation of resources like France) which is a speciality of the British bureaucracy will mean that high value-adding industries relying on long-term planning and investment (chemical industry, defence and bio-medical comes to mind) will find a natural home in Britain.
I think essentially this 50% choice is part of Britain's convergence with Europe. Over the past 30 years we've increasingly begun to act like Europeans. After the war we were too left-wing, then too right-wing, but now our political sphere has begun to centre on the same issues that dominate every other country in Europe. The problems of a disgruntled, empty and yet popular prosperity.