Tank cleaned, sealed with KBS, painted, and then I leaned on it and snapped off the outlet (doh!). It will need to be welded back on and though the tank is dry and long safe to weld it will need the tank sealer, rock guard and paint touched up after as well.
I decided to cut my losses and bought a new WW tank.
Free until Monday when it will go in to the recycling if no-one speaks up.
Steve