- clearly missed all the fun on this last night

Welcome Ken.
Several years ago I spotted the Evans waterless coolant (at the NEC show, I think) and was tempted to use in my (then) original Toyota MR2 T Bar.
I checked with my garage mechanic who,coincidently, had just installed a new radiator on a clients restored MGB.Said client had insisted on using Evans coolant at a not inconsiderable cost so mechanic duly obliged.Next day coolant system sprang a leak (elsewhere in the system) and all the expensive coolant was lost.
I'm afraid it was enough to make me re-consider the plan.
So for me,not a deal breaker I know,but you have to consider,amongst other things -
* Evans' claims for product - are they proven?
* Cost of product/install
* Can you clear system of sufficient 'old' water/coolant?
* Potential 'masking' of other problems
* Problems re. 'topping up' when away from base
All things considered,I think I would be ensuring the existing system is thoroughly cleaned and working to spec. and give the Evans a miss.....
Just my two pennies worth but HTH, James