Registering for GAMSTOP will prevent you from logging into or setting up gambling accounts with online betting businesses licensed in Great Britain if you are a UK resident. GAMSTOP is a free service through which you can register a nation-wide self-exclusion for a period of 6 months to 5 years.
Find out more about more about the multi operator self exclusion by watching this video https://vimeo.com/369796778
GAMSTOP's "contact us" page can also be found here: https://www.gamstop.co.uk/contact-us