Yeah I am just wading through CAP 804 now ....
I can't see anything else that is exempt, but I know if you have a valid(current) rating at a unit then you are exempt from the Comms/RT exam.
Yup ... found it:
Holders of a valid ATCO licence issued in accordance with EU Directive
2006/23/EC are credited with the PPL communications theoretical written
examination and the 24 month examination validity period shall not apply.
Applications shall be made using Form SRG\1162 which can be downloaded from
the SRG web site:
Statistics | Pilots | Personal Licences and Training.
Can't find anything else that is exempt. It'll just come in handy when studying and doing the exams ... no worries