Engine failed to start this morning. Called RCR. Advised problem may be insufficient charge from alternator (not convinced). I did notice this evening that turning the engine battery isolator causes a relay to click. Suggests some battery drain while battery not isolated, if only to hold solenoid.
Can jump start by connecting +ve domesgtic battery to +ve engine battery (that's what RCR engineer did). Bought jump leads in Loughborough.
Disconnected starter battery when moored.