I agree with Stuart that a relay for the ignition switch is a good idea.
Not my idea, I've never fitted one; Gavin advised the idea?
Ooops, sorry 'bout that ... it was/is somewhere in the thread before Dave's first post ...
(or "It wasn'y me, a big boy did it an' ran away"?
my Boyer is not relay fed, I reckoned the ignition switch should manage 3 amps.
My thinking too.