Many thanks for the replies, pretty much my own thoughts too. I only ask as despite one of my colleagues running his 2010 Range Rover Sport on B100, the other with the 5 year old Audi has yet to 'take the plunge'.
Strange, isn't it, how conditioned we are to trusting absolutely the dino fuel? Anything else will wreck your radio, give you arthritis, make you grumpy (apologies Jim!), ruin your wheel bearings......