Due to spending most of the winter months in Spain I always Sorn the Plus 8 and in the five previous years have had no problem with the car starting first time..
However today with it due for an MOT of course it wouldn't cooperate, the start button would light up but the engine refused to fire.
Tried the usual things, battery boost etc but no good, I then realised the 20A start fuse had blown as did its replacement.
Rang the factory for advice and as always incredibly helpful, they thought it was probably a sticking starter solonoid, a common problem with low usage and suggested changing the fuse to a 30A might solve the problem, hey presto, started first time with the new fuse.
Apparently the wiring can easily cope with running the 30A fuse.

Worthers +8