The UK's Labour Government is predicted to announce tougher sanctions against tax evaders when it unveils its Budget tomorrow, with Alistair Darling, the Chancellor of the Exchequer, expected to double the penalty on tax evasion to 200% of the money owed.

The last thing is wants to do ahead of the election is to ratchet up tax demands on everyone else. But tougher measures are unlikely to see a rush of tax evaders bringing their money back onshore if past efforts are anything to go by.