I have a UK 2008 GTC with 32K on the clock which is seldom used and always kept on a Bentley Trickle Charger in my garage, recently it refuses to turn over using it’s starter battery however does so once the auxiliary battery is engaged, therefore I have now replaced the starter battery, once under way, after a half mile or so onscreen message advises that the air conditioning switched off, followed by another advising that the electric consumers switched off, then infotainment screen and dash display briefly goes blank for a period prior to coming back on again, also occasionally I have an issues either lowering or raising the roof and auto hand brake refuses to release, can anyone point me in the right direction before I am forced to give it to the main dealer to address and charge the earth ? Alan.