At around 75km, just outside West IIsley, in the middle of nowhere, I came under the same planetary influence that
George Berwick did on the HBKH in 2010. Although I'd emphasize right from the outset that how events ensued for me pales utterly into the background compared to the show stopper that George managed to pull off during that event. There is no comparison.
So, down tube breaks and inch from the headset [where they so often do] and now back to quiet leafy Compton. It's the nearest place. No, not much welding action round here, and I wasn't in the mood to start knocking on doors either. There is one shop though. Helpful lady gave me some double sided tape and a pair of sissors and I bought some utterly useless cheap brown selotape. So, into the bins to retreive two coke cans. Cut them up to use as sleeves and tried to zip-tie [had only a few of those] and tape some kind of repair together. I knew right from the word go that this was only going to be a 'get me home' strategy [if that] and most definitely not a 'carrying on' one. Considering what I had to play with, it wasn't too bad, but it only lasted about 7 km before the head tube popped out of the coke can sleeve and I was down to the top tube as my main structrual support. The tape was the problem. Cycling about 20km with the down tube completely detached from the headtube is unnerving. The utmost care was needed.
Managed to limp back to Henley, where things really came together. Got chatting to a couple of musicians who were loading gear into a van for an evening gig, and they gave me a big roll of British Racing Green Duct tape. Nice colour- never seen green gaffer before. So now, repair no 2: cut away old failed repair, tape tubes together first [they're now a couple of inches apart!], apply coke can sleeves with tape, tape more, find thick twig to act as a spine and more tape - and the next 50km were no problem at all.
Shame not to make it round, but I ended up doing 160km in the end, and got back just as the light was fading, so all is well.
Quite a big field out there today - biggest I've seen on the Anfractuous since I've been doing it.
Thanks to Manotea and all helpers.