Thought I'd give you an update and wonder if anyone has any thoughts?
We arrived at the boat and removed the hose and took it to Pirtek. We said it was a fuel hose for a boat and they said they could have it ready by next day.
It was as suggested 1/4" Wade universal. We collected it and refitted and were pleased apart from the exorbitant price. However we were in a position where we no choice due to time restrictions and the BSS inspector coming the next day.
Well the bad news is it failed as apparently isn't compliant. We said we wanted a second opinion from the BSS office. Awaiting the outcome.
I will attach a photo of the hose before it was fitted.