If it is a bonus payment it should be non-taxable. It is the same as the annual city bonuses, they pay a good salary but hold back to ensure a large bonus as it is non-taxable hence ensuring that the empoyees of the City's financial institutions are well looked after.
Is it? Or is it a knee jerk reaction to something which has been raised in the press. It is hardly likely to be well thought out and as people have said already there will only be one winner and I doubt Gordon Brown will be out of pocket.
It stands to reason that if you are paying 40% tax then you will get more cash back than if you are paying basic level tax at 22%. That said the threshold for 40% tax is set low enough to encompass Captains,, SSgts (Low band Lvl 5) or Sgts (high band Lvl 7), I wouldn't say that they are that senior.