Not really correct Stewart
The Plus 4 had the higher scuttle and the term lowline came about when a certain Chris Lawrence rebodied TOK with the lower 4/4 body apparently against the wishes of Peter Morgan who wanted to keep the 4/4 and the Plus 4's separate.
Arwyn
Yes quite right, I got the models mixed up - it was the plus 4 that was originally the ‘highline’