Thanks Pacman67 - shouldn't have been lazy and read up all the documents myself. As you say it seems to cover it just fine and indeed mainland Europe for same cover
Page 6 of the
manual Please note: Immobilisation of caravans and trailers are also covered but only when being towed by your vehicle. The caravan or trailer will be recovered along with your vehicle.
Will call them to make sure all covered - may have saved us a few quid for the summer Europe trip thanks!