Mmm, I can not really see a problem
Have used the Iban numbers as a last resort for payment in the past, did one this week, for a buyer on the south of France, no problems,
I would ask if he has a Paypal account first, If using Iban, make sure his bank sends the full amount in sterling to you, Just sold a Freelander rain cover to Italy, for £110 inc post, his bank only sent £ 100, so he is trying to see where the lost £10 has gone, My bank say, that's the full amount sent ???? this is the only problem I have had, maybe lucky !!