After all that I forgot I could just put the reg into DVLA to get the details and it isn’t a Plus 8 according to their records
It’s down as the engine having 1994 cc’s and being first registered in 1998
So much for my research although I was right on the Plus 8’s from 1991-mid 1997 having single exhausts and also having Morgan script badges
So it’s a 1998 Plus 4 with the Rover T16 engine
