Power to the multitude
I'm guessing most contractors couldn't afford the initial legal fees to start off-shoring their income, but I reckon ten thousand contractors could band together and achieve Amazon tax status, with a trust in the Caymans or other British but not full British island.
A trust who's beneficiaries will never be revealed, that owns multiple shell companies, that pay astronomical sums to the trust for the use of a brand name, that bills your employer for your work.
If it's good enough for the filthy rich, mobsters, drug barons and despot rulers from around the globe, it's good enough for the hard-working lackeys of Britain.