Here we are, having finally realised what we needed on the deck and how to do it. First, Pete mounted brackets against the gas lockers so the the parasol is more or less centred over the seating area, when not cruising of course. Then he cut the table top, mounted supports underneath, and fitted a foldable leg. A lovely little tartan footstool sits on the BFG's hat (the generator's cover) and hey presto, there is a seat opposite the bench.
There is room for someone to sit next to Pete on the bench and room for a dining room chair to come out and be next to the seat opposite. So, eventually, four for dinner out on the deck!
There is still sanding and sealing to do, but we're delighted so far! Pete pours a beer with satisfaction.