I think that may be correct. I for instance seem to recall seeing the last chassis number Plus 8 in the collection area at MMC whilst there were still Plus 8's on the line.
I thought that was because there was allegedly more than one 'last chassis number' Plus 8 produced.
Brian
1970 Morgan Plus 8 - Moss Box (Indigo Blue) 2014 Morgan SP1 (Rocket Red) 2015 Morgan Plus 8 (Rocket Blue)