went arse over **** right in front of me 20 seconds later
Sounds a lot like me. Second climb, dude waved me past on the right, just off trail. Turned out there was a wheel sized holed under the grass; straight over the bars, landed on feet, grabbed bike and ran up the steep section till I could get back on. [Carbon full susser, was wearing the hideous purple/pink 2002 Scotland kit at that point]
Passing was fine once you sorted out the pre-pass chat, "I'll squeeze past when you there's space, no hurry", worked really well, usually got let past within a few seconds. Thanks to all the nice people who made those exchanges pleasant. There was one gentleman who barraged me for the above with some horrendous language, possibly he missed the point of these events.
Cracking day out, although driving back in the Biblical rain was a bit much.