Look.. I understand that you're from the UK. But that's what we do with 4x4 here. Some people more than others but none the less.I watched in disbelief , listening to the two of them bleating on about the treatment received from Ineos. ( watch the recording of their full trip) No manufacturer should be expected to provide warranty cover for that level of extreme use. If you want to take that level of risk, have the common sense to understand you may have to deal with the consequences!
I've got an old school defender that's been to the cape on that track, spent nearly a year of it's life on a beach, been across the desert a dozen times. It hasn't had any mystery failures. If you sell a 4x4 as a car for the outback here that's what you've got to expect people will use it for.