kanga...i think beagle is right.
check with the caa.
i have renewed several for the caa...at the request of the iaa.
if the caa agree you can do it,. put your request to the iaa and depending on where you are they will allocate an examiner.
when the LST ( licence skill test ) is done they will return the paperwork to the caa with a copy of the examiners authority and the caa will renew.the LST can be done abroad if the caa agree the jurisdiction.
good luck..
the dean.