I have a non-UK resident client who has sold a UK property. They've set up a Goverment Gateway account (using the alternative process as detailed here), but I've hit a snag in obtaining agent authority. Having created the link to send to the client to authorise us, when the client logs in to complete the authorisation he is asked for his NINO (or UK postcode) to confirm his identity (neither of which he has).
This seems to be a fundamental flaw in the system. Has anyone else experienced this, and more importantly has anyone found a workaround (other than submitting the return using the client's log in)?