Well, I'm back now. The first half of the ride was very wet. We had rain from around Tooting onwards, getting progressively wetter and worse. Some left the ride after the Cabin Cafe, but the majority stayed on. Strangely enough, the second half, after the Cabin Cafe was almost entirely dry. We had a few spots, when it was threatening to start up again, just after sunrise, but that was all. It was pretty dry from the sky, although the roads were pretty puddled, and in places quite deep.
Aside from my shoes and socks, which despite overshoes, were utterly soaked (not helped by stepping into a muddy hole in the ground when helping out with a fairy visitation), and my gloves which whilst wet were still fairly warm, most of my clothes are dry. I did swap over to mitts which were dry, and a bit warmer than the gloves, during one of the many fairy visitation stops.
I think this ride probably now holds the record for holes. The man himself had three, and at least one other unfortunate soul had two. I was there for five repairs, passed two others who didn't need any help. I suspect we had multiple repairs being undertaken simultaneously.
All of that makes it sound bad, but actually it was a great ride, grinning in the face of adversity.

It was also quite a novel route, for me, not going over Ditchling, and coming into Brighton from a different direction.
I am however knackered now. The guys planning on cycling west along the coast are going to be utterly thrashed, if they manage it. Just cycling a few hundred feet from the cafe to the roundabout, along Brighton front was very hard work, there were some big breakers on the sea front, and the wind was blowing in.