first batch of replacements parts arriving at the factory early July, how about the next batch=???
plenty of mechanics on holiday in July&August, some shops even closing completely
2-4hours for the work: I would rather guess they can do 1 per day: you already need some time to get all the stuff together, put the car on the lift, paperwork, have tea if in UK (

): that alone is about an hour work
I just hope to go to our wedding in my own Morgan: October, otherwise I can probably loan a 3wheeler