Around 200,000 people work in the financial sector in the UK in non branch positions. These are the positions that would move abroad.
This tax would kill the industry because I personally have been sounded out about a move to Switzerland if a tax is introduced. Most people have. Why would our bank pay 0.5% transaction fee for trades and investments that could just as easily be made in another country? It is an industry killer, I think the only banks left would be RBS, Northern Rock and Lloyds and since none of these are high yield or have decent investment banking arms the City would be dead.
Also the tax wouldn't be used to 'repay the debt owed' it would be used to prop up the Euro. The debt owed will be repaid when the government sells its stake back to the markets. It's an investment after all.
I think we're just going to have to agree to disagree mate.