Its easier to see if you take a picture of the bottom of the hull, the chines and strakes might give it away but cant see them with the deflated pontoons in the way.
I have emailed rubberduck for repontooning and they recon it is a 4.8m Superduck.
Thanks for the messages.
Boat is with Jo at the moment and as soon as he is done, I will take it for repontooning, COF and me for Skippers.
Can wait to get going.