The Public Accounts Committee highlighted the way some firms seconded staff to the Treasury to advise on technical issues in the drafting of legislation - only for the individuals concerned to return to advise clients on how to use those laws to avoid tax.
Through their work in advising government on changes to legislation they have a detailed knowledge of UK tax law, and the insight to identify loopholes in new legislation quickly.
We have seen what look like cases of poacher, turned gamekeeper, turned poacher again, whereby individuals who advise government go back to their firms and advise their clients on how they can use those laws to reduce the amount of tax they pay.
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We're all narcissists now (aren't we) so it must be OK for me to see the prism of UK politics through my two stints as a political editor.