Know your enemy…
https://www.independent.co.uk/voices/brexit-tax-evasion-eu-us-laws-uk-donald-trump-theresa-may-avoidance-a8007426.html
https://www.taxjustice.net/2019/01/23/brexit-and-the-future-of-tax-havens/
The Tories have an awful lot to hide (and possibly lose if Brexit doesn't happen.
Also, know your allies.
https://ec.europa.eu/taxation_customs/business/company-tax/anti-tax-avoidance-package/anti-tax-avoidance-directive_en
Things aren't always as they seem. The shysters and chancers with offshore trusts and shell companies are bricking it.