Thanks, guys - and no probs Dave about having dropped me. Given that I still have a headache, I think calling it a day at that point was sensible. I'm still a bit wary of taking knocks on the head after having had a concussion last September.
Sorry to hear that the ride was interrupted by punctures. Sounds like you got to Newlands about the same time I rolled in to Bockett's.
No chance of it putting me off. The Whitedown descent was particularly good fun. Hopefully some solo rides over the next couple of weeks (with a Garmin) will help me get my bearings, not to mention help me keep up.
Just a shame it happened on a quasi-climb as I rely on those as my salvation!
I think I'll give out my mobile number on the next ride, though. Just in case.