Hi Ian & JimBob!
Thanks for your input.
My particular interest was what the rear pod passenger had to hold on to. It looks like there might be a hoop, judging from the front of the triple seats.
My concern is that the "in line" seats are perhaps too "cosy" and the person on the rear seat can't see where he or she is going. This is not likely to be very satisfactory on a Channel crossing, for example, even if it would only take an hour and 10 minutes from the Needles to Cherbourg (flat out)!