PROGRESS: Sunfold Systems decided to send a team of fitters to sort out these leaks properly. The idea being to lift out each pane of (enormous) glass and re-fit them, re-seal them and thus stop the leaks.
Rob and I spent an hour last night clearing every bit of furniture and associated debris from downstairs underneath the glass (ie most of the dining room). I did 20+ trips up and down the stairs while Rob dealt with the fiddly stuff. We then stacked the heavier bits and watched the drips land on our artfully arranged selection of pots and trays.
I managed to damage our Arco lamp when I thought I was unscrewing the bulb but was in fact shearing off the fitting including the wires. (Fortunately Rob knows how to resurrect this from his distant past as a scientist with a qualification in electricity or similar).
Sunfold's crack team arrived this morning ON TIME at 8.30am and were done by lunchtime. After so many visits which ranged from no show to late to not resolving the issue, I was beyond happy.
Apparently our problem was caused because the frames the vents (windows) sit on leaked at the joints - which is a manufacturer fault as they come pre-fabricated. It's Sunfold's responsibility to remedy even though the frames are manufactured in Germany. I am waiting for a rain storm so I can confirm that everything is water tight. Everything is crossed.