After a jaunt to the Italian Car Day at Prescott today in the Aeromax

(well it does have Lancia tail lights ) returned home parked in garage and as usual isolated the battery. 10 minutes later realised hadn't emptied the boot (which works off a solenoid on the Max) so open bonnet press isolator switch back in key in ignition...nothing

. Try pressing switch to flick isolator...err lets call it a tab out and do again except now it doesn't flick out

Any tips or ideas appreciated as now can't start the car??
Not sure it's related / relevant but engine management light was on today (last time I used it was off and previous time it was on so assumed as not using much (did have it's 2 camshaft sensors replaced by the factory 6 months / 400 miles ago?
Hopefully drier weather on the way for everyone to get out (even saw a blue S1 Aero on the M5 Northbound Wednesday near J14)
Cheers