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No, if you exceed 25 mph you will be in FWD mode - the lock merely ensures 50:50 power distribution up to 25 mph. And, it's a car rather than a snow plough - ground clearance is only 200 mm / 8" so while I'd be happy on snow up to, say, a foot deep I wouldn't expect to push it through drifts a metre deep (but, there again, I'm a reasonably cautious / rubbish driver! )

True, but then again they do have a 3-pin socket for the standard domestic 16amp charger. It only takes 3 hours to fully charge an empty battery in my experience 😀

The 4wd system on the T180 is exactly the same as on any other RAV 4.3 - i.e. the 2006 - 2012 model range. It starts in 4WD mode and progressively switches to FWD as the speed reaches around 25 mph. The lock button aims to keep the car in 4WD mode (i.e. not allow it to switch to FWD) but, TBH, is pretty much redundant as it automatically does what is needed anyway. Traction control uses the brakes and 4WD system to divert power to the wheels with the most traction so it's really quite difficult to get stuck. A 4WD RAV 4 is perfectly capable of dealing with the snows we see in Powys - it can provide pretty much all the traction you could want - but you will want winter, or true all season, tyres to get the best out of it and to be able to stop when coming down the hill!

Just incase anybody else needs to know the answer to my question. I've just bought the parts I need from the local Toyota main dealer:- X1 stud X3 12mm nuts, X 3 gaskets, I paid just under £30. Places like Turbo Technics and Midland Turbo could not and would not supply me with the above items ! This may help others out?