As your SEP has now expired, You need to do a Renewal Proficiency Check(PC) with an Examiner, Who will sign your Certificate of Renewal in your Licence.
Before doing this, you will have to go to an ATO/RF(Flying School) and have them assess how much, if any, refresher training you will need to pass the PC.
Once you have completed the training, if any, they must give you a Course Completion Certificate (no matter if you were required to do any training or not) which you must present to the Examiner, before the PC.
Your Examiner must also complete the National Standardisation, before carrying out the PC, if he/she is not a UK Authorised Examiner.
I would suggest that, as your Examiner has made the mistake of signing your Certificate of Revalidation, he may be sympathetic to your plight.
MJ
