I believe that the wait varied from Dealer to Dealer, for example I placed an order direct on the factory for a Plus 8 in 1976 and it was delivered in July 1982 - 6-years to the month.
Brian,
I'm sure that is the case. My father ordered his last Morgan round about the same time( might have been a couple of years or so later) and we had a similar 'time window' quoted to us by Derek Day
I seem to recall he was quoted shorter times by some dealers ( John Britten I think- remember those poems in the "Motor Sport" ads!) but whether this was for a new car or one which had been purchased by an individual and then immediately sold on, I'm not absolutely sure
regards,
G