Mountfield mower spares or repair (Orpington BR6)

Mountfield Empress SP16 self propelled 16” mower.
The good stuff, runs and cuts well. Starts easily, normally first pull but may need some easy start after a winter layoff.
The bad stuff, the plastic body is cracked in places, the main issue being the ride height can’t be adjusted and is now too low. There is a petrol leak, I think from the drain plug on the float bowl, possibly just needs a new washer or seal, but I just top up the petrol for each use.
So a new plastic body is needed, the rest of the running gear is all there and works.
Condition is old and well used, see photos.