A couple of years ago a visiting DPE (Dr Janeen Kochan) came over to UK and I went to Denham (where she was based temporarily) to convert my paper FAA cert to a plastic one and get English Proficiency added.
Saved me a trip to USA: The FAA stopped the visits shortly after but I understand her UK visits are about to resume if they haven't already done so.
Google her name for contact details.
Cusco