If you live anywhere in the world excluding the USA the best way to avoid taxes is to become a nonresident. This also applies to the UK.
Move to a tax haven, to do this you must cancel your health care coverage, not renew your drivers license, sell everything in your home country including house and car, make sure you have no memberships, stay out of your home country for over 6 months a year. It’s actually really easy for UK citizens to do.
This is the only way to completely avoid taxes. Yes you can hide the money offshore but its pretty pointless, as besides spending money you cant use it to buy cars, houses, etc
Some options:
Vanuatu
Cook Islands
Bahamas
Turks and Caicos
Cayman Islands
Anguilla
Some people mentioned other tax havens earlier but the above are the only ones with true zero taxes, and that means no more paying an accountant or annoying paperwork.
Some of those like the bahamas still have property tax, but most use a higher import tax to make up revenue. 20% import tax is probably the norm, but this is different as a sales tax or GST… as its only applied to products and not services.