Adding EU driver to my policy

I want to add my father in law to my insurance policy - he lives in Rep of Ireland and is taking my new purchase (2002 Boxster) to his mechanic.

I've tried my own insurer and they can't do it. I've tried taking a new policy on a comparison website but when I get to the point of adding him it askes for time lived in the UK and obviously he doesn't.

Anyone know who to get round this - legally.

Thanks.