Trust me to pick the one load cell with a display that was massively out of calibration.
Having carried out a few tests I found that it was over reading by only 75%!
The corrected numbers are:
Complete engine 'cut out' as removed from the car (ie. engine, all pumps, alternator, 'box, engine loom, manifolds, mounts, fan etc) = 255kg
Engine less 'box and torque converter = 186kg
Chris.