on the subject of tax deal4free say this on their website:
Tax free profits
Financial spread betting is one of the most tax efficient ways of investing in the stock markets and other financial products. All profits you make from financial spread betting are free of Income Tax, Betting Levy and UK Capital Gains Tax.
The position as we understand for UK Residents it is that currently under case law, betting winnings are generally not subject to tax. Where spreadbetting is done on an ad-hoc basis, and as the law currently stands, winnings are not taxable. However if for example banks and investment firms started wholesale spreadbetting to complement their dealings in other financial instruments, then it would be quite likely that the tax authorities would challenge such a scenario and 'could' seek to have income generated from such activites taxed.
In addition, this status would also appear to apply to professional 'gamblers' and 'spreadbetters' where as it currently stands, the inland revenue do not seek generally to tax winnings on spreadbetting. It does appear that should the tax authorities wish to incorporate taxing such winnings in the future they would need to seek an amendment.
This does not however preclude individuals who may have a very particular position or case which creates a situation that applies to their own specific circumstances."
As of October 6th 2001 the Chancellor decided to abolish Betting Levy, making spread betting a completely tax free* way to trade.
(*Tax laws can change)
So that clears that up then!!!!!