@Luc ***********
not needed as insurance cover is not an issue bizarrely enough! The travel insurance he has provides him with full medical cover in case of any accident on a motorbike, just as long as he has completed a CBT course in UK (which he has), he is wearing a helmet (he will be) and the motorbike is <125cc. It wouldn't cover him for any 3rd party liability though, in case he was at fault. Being a farang, I understand that he almost definitely would be deemed to be at fault, irrespective of whether he actually was or not!