Spent this morning trying to figure out the issue with the speedo!
Stripped the dash back, jacked the rear up, ran the car in gear with using a multimeter on the wire going in to the back of the speedo (yellow and green) and got no readings.
Tested the kph/mph converter as well but taking it out out the circuit but no difference so looks like it is the speed sensor itself or the cable!
Also, fitted new steering wheel (proper wheel but recovered and looking lovely!) and also fitted the new window seals.
Both a really easy job but make a big difference.