Unfortunately, you can't transfer your Laka account between GB <> Europe. Simply cancel your account at laka GB or laka EU, and create a new account in your new country.
You'll need to use a new email address, or you can edit your email using the '+' operator. For example:
Laka is available to consumers in:
United Kingdom - https://laka.co/gb
Netherlands - https://laka.co/nl
Germany - https://laka.co/de
France - https://laka.co/fr