See
http://www.bluerobin.flyer.co.uk/jarreval.html
(last para)
"SEP Renewal (after 2 years)
If you have failed to achieve revalidation as described above, all is not lost providing you are within the 5 year rule. The is no specified method for re-training. You only need to undertake a proficiency check with an examiner, which is a test like a club checkout with the usual stalls, steep turns, EFATOs, PFLs etc. It is not a full GFT but there is a pass or fail mark given. Of course you might like to undergo some retraining with an instructor before taking the test."
Get the SEP done with a JAA examiner and the form sent off
You also need to fess up some money to renew the 5yr licence period (paper exercise).
How do you propose to get yourself alongside a JAA examiner? CTC maybe?