At a starting price of $235,525, the Bentley Bentayga is the priciest sport-utility vehicle out there, appealing to SUV shoppers for whom cost is no object. Or is it those for whom cost is exactly the object? Those latter folks, particularly, may be interested in the 2018 Bentayga Mulliner, which brings a raft of Bentley bespoke specialness that will send the sticker price even higher.