[thomasedwards]

I want to believe you but their website says:

    Leave.EU Group Limited trading as Leave.EU.
    A company registered in England & Wales. Company
    Registration Number 9763501 Registered office:
    2430/2440, The Quadrant, Aztec West, Almondsbury,
    Bristol. BS32 4AQ

Edit: EURid says it’s registered to “BETTER FOR THE COUNTRY DIGITAL MARKETING SERVICES DESIGNATED ACTIVITY COMPANY” in Waterford, IE

[heftig]

What the website says doesn't matter; the registrar says the owner is in Waterford, Ireland:

https://whois.eurid.eu/en/search/?domain=leave.eu

[iso1210]

https://whois.eurid.eu/en/search/?domain=leave.eu

  BETTER FOR THE COUNTRY DIGITAL MARKETING SERVICES DESIGNATED ACTIVITY COMPANY
  WATERFORD IE

[yread]

OP is right

Organisation BETTER FOR THE COUNTRY DIGITAL MARKETING SERVICES DESIGNATED ACTIVITY COMPANY

Address

Waterford IE (Ireland)

https://whois.eurid.eu/en/search/?domain=leave.eu