Sorry Skully, completely failed to register anyone tooting their hooter at me
Actually, drifting slowly across the back of what's left of my mind there is a fading echo of vestigial memory of thinking something along the lines of "I wonder what that noise is?"
My clues are too easy!
@Ludd it was me in a car at Brockley Cross hooting at you on Wednesday. Waving manically too, but I guess the windscreen was reflecting too much.