hello Spacemonkey, thats a fair question.
I bought the car at 4 years old with 36k on it, it was one owner and full Landrover history, with no record or sign that the vcu had been changed.
so i cant 100% vouch for the full mileage, but I've put 170k on it since.
i make sure that i rotate the tyres and only replace all four together.
I live in the west of Ireland and therefore most of my journeys are at 60mph in 5th, with very little town/city driving, I also have a rough gravel lane up to the house, so i engage the 4wd every day, i can only think that a combination of these two facts are the reason for the long life of the VCU.
I note the often quoted 70k lifespan, my own opinion is that this may be relevant and good advice for the UK, but could be a bit premature in other cases. Its a gamble based on vehicle age, annual mileage, value, access to a second car and the ability to do work myself when needed.
I've never done the VCU test, but i keep a keen watch on how the car drives.
Having said all the above, i kind of expect that i'll be starting a 'my VCU failed' thread in the next 12 months
All the best, and thanks to all for the excellent advice on here.