Thank you all for your posts. Very thoughtful and insightful. The poster above also hits the nail on the head when he talks about UK buyers. I read somewhere that the RX hybrid is the fastest selling lexus in the UK. Yet no-one seems to have asked my question on any of the forums. There's more to this than meets the eye and personally I will err on the side of caution/discretion, and opt for another manufacturer. It's a shame. I really wanted a Lexus, but I would never be able to get into the car without a nagging doubt in the back of my mind, so my feeling is it's best to leave it.
In researching on the web for an alternative large family estate car I also came across the EMF 'scandal' that recently rocked Volvo. So the V70 is out as well.
My options are being rapidly reduced by the minute....