If I transfer my UK issued EASA licence to a new state of registry, does my existing licence remain valid for Non-EASA aircraft registered in the UK?
ANO Article 50A
(3) A person must not act as a member of the flight crew of an excepted aircraft unless—
(b) the person holds an appropriate licence granted, converted or rendered valid
under the EASA Aircrew Regulation.
So any EASA licence is valid for a UK Annex II aircraft.