The situation is more complex.
The italian road code ( codice della strada) does not define the safety cell
In Italy it is invoking the judicial practice:
https://books.google.it/books?id=-kYtsXF...uta&f=falseThis definition includes the simple roll hoop present in a 3 wheeler
( like a Caterham ) I have a Caterham with fia roll bar but the original one was anchored like the morgan one.
remember that in Italy the microcars (which you can drive without a license) does not have the obligation of the helmet ( but you have to use the safety belts ) and the roof has no load-bearing function
The second lecture ( B ) from art 171 CDS is the correct one for Morgan
according to Peter ...I use a lightweight helmet anyway :):)