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So what was the difference in the wax composition that makes the V1 V2 and V3 different?
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I'm curious as I have a leaking upper coolant rail to attend to on the old man's car, and if I'm replacing the o ring on the 'stat housing, I'd like to fit a thermostat that was unlikely to fail in the same way as all of the others I've seen.
Brian 
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Hi Brian.
Would the upper coolant rail be one of these below.
https://rimmerbros.com/Item--i-STC4646A
https://rimmerbros.com/Item--i-PEP000130
Either are a nightmare to remove and fit
I think the V3 was commissioned by DMGRS
same outer casing i presume i could be wrong but different thermostat or wax part? again whom knows.
I agree only time i would remove the original stat would be if it were leaking, or the water pump needed changing, other wise inline stat every time.