Some good news (for once) now I've had a chance to look at it.
It was humming a lot before it got hot and then tripped the electrics. I could get my hand up the impeller tunnel and turn it by hand to confirm nothing was blocking it. So the next cheapest option was swapping the capacitor...which seems to have sorted the problem, i.e. it now turns immediately on everytime I switch it on...result !
(although when I went to buy the new capacitor, having had a look on ebay for exactly the same thing...5quid from the UK.... 18€ - how much ??? )
I'm not a geek, I am a technically aware early adopter