'Cos we had to push to fit him in with an instructor today , and luckily had an examiner to sign his licence as he was only passing through .
Unless this was a UK Examiner then the revalidation is not valid! Was any paperwork sent to the UK CAA (SRG1119E)? If so they will spot the Examiner, if not, then they will have no record of it. His best option if he has not passed the original expiry date would be to get it countersigned by a UK Instructor/Examiner and the paperwork completed.