It is, perhaps, astonishing to learn that the Bentley Bentayga has been around for one year short of a decade. The first Bentaygas to roll off the production line were powered by the W12 engine followed, perhaps surprisingly, by a diesel version. These were joined, in order, by Mulliner, V8 and, finally hybrid models. As car fans we are, perhaps, accustomed to the muted rumble of large-capacity engines beneath the long bonnets of our most luxurious motor vehicles and, for me at least, it’s hard to separate one from the other. Separate them I must however, because this hybrid Bentley – like the…