Think Defence,
I dropped the Scorpion with the Jaguar petrol engine (very fast and huge fun until the army wanted it back) and I am sure we used the MSP with an overload clearance. When the diesel heavier engine version came into service I think the HSP was used but after my time at JATE. I have lost many of my pics of the era but perhaps dragartist could shed some light on this matter.
Just a sample of what is on the 'Hercules thread I mentioned.'