Just for what it's worth then,
In humour mode,
and this is a totallty true example, from a gent in Tesco's carpark Sudbury Suffolk, but a few days ago.
" Oh, a Vincent, is it watercooled ?".
This person is looking across the top of the Seib Sidecar at the fins of both cylinders !!
He made an exit in a very very large 4x4, none the wiser, nuff said.
Seriously though what can you say?
go careful mr hutch