Mr Huiston set up Isle of Man trusts to avoid British income tax.
The scheme was entirely legal and ran for seven years until Parliament closed the loophole retrospectively in the 2008 Finance Act, and issued backdated demands for millions of pounds.
Changing the law to close "loopholes", and prevent them being used in the future, is one thing. However, retrospectively applying those laws to tax arrangements set up legally and in good faith is contrary to the fundamentals of British law.
David Elvin QC is acting on Mr Huiston's behalf in the Appeal Court and is challenging the retrospective law, on the basis of a breach in human rights for people to be allowed to have "free enjoyment" of their private property.
"The degree of retrospectivity is unprecedented in the history of tax legislation and imposes an individual and excessive burden on users of the (tax avoidance) arrangement."
It will be very interesting to see how this case progresses.
Tax does have to be taxing.
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