Let me now see, is it yourself or the other clone who is the brilliant Economist?. A billion here a billion there, its only small change but it adds up. The EU will have a Transaction Tax, , The Irish Revenue will have a real 12% Corporation tax...maybe even higher if the EU has its way. Those wealthy bankers still have to pay personal income tax, eat in fancy restaurants, send their kids to the International School, (which will be a cost saving compared with Harrow), get sick, go to the Blackrock clinic, buy that rugby gear ,and pay property tax.
40 billion in transferred assets by one bank is not small change, but then if course ,we don't know how many other banks each with their 30 ,40 billion each... With 10 or so it might actually matter....
Note this business is now lost to the City of London ,and will not be going back.
Each of the contracts signed in the City of London attracts a small stamp duty tax,but even a small duty on a lot of big transactions,builds up. Money which the HM Revenue use to pay for education ,police services ,hospitals etc....