Greetings,
Revalidation by experience: As Mach Jump wrote, any EASA instructor can carry out the 1-hour flight instruction.
The paperwork must be completed and verified by a UK CAA Examiner.
However the UK CAA approved examiners do exist outside of the UK. I just had my license revalidated in Denmark. Alternatively you can send the forms and licenses to UK CAA who will then sign it for a fee of 88 pounds + shipment.
The form you need to fill out, is SRG1119E. This should be done with the examiner, who will then send it to UK CAA.
I suggest you contact some of the flying schools in the area - there is probably someone around. If not, please PM me and I can guide you to one in Denmark if this is easier.
-CTE