Thanks for the quick reply Bruce.
You are right about the pull cord!
I didn't actually remove the blade plate, but I think it may have come loose while I was doing a bit of levering to undo the blade nut (quite corroded and very tight)
I tried to access the Parts List and Manuals Forum but I don't have access?
Are you able to post up the relevant pics for the plate replacement and for the decompresser?
Cheers
Yogi