Interesting.......
I would have thought that any account one might have with the Camelot group would be connected to ones British home address and so long as one plays the Euro-lottery in an authorised Euro-lottery country one should be able to claim winnings at ones home address.
Obviously, one will not be able to play a LOCAL lottery abroad if that lottery is not sponsored by Camelot.
The Spanish lottery - El Gordo - ( The Fat One ) - springs to mind here.