This contradicts Part MED and the guidance from the CAA themselves, see page 4 here:
http://www.caa.co.uk/docs/2330/Webre...kguide__v2.pdf
The issue may be to do with the fact that the AME uses a PC Program to record the data - and print the certificates - and it only recognises the UK (GBR now) as the state of licence issue. We have a German JAR FCL licence holder who had a problem with our UK AME because of this and it was resolved through using blank certificates hand written, I believe.