OK so here is the latest.

Took the engine out of the XIGRIS and put it on the test stand.Started the engine and fuel sprayed everywhere initially it appeared to be coming out of the carby but on closer examination with reading glasses on this was not the case.
The fuel was coming from hose next to the carby ....Hose replaced and problem solved'

Moral of the story put your GLASSES on.

rgds and many thanks