Well, the puncture fairy got me good and proper tonight after a blemish-free decade. On a rare excursion along a psychlepaths (that's somewhere I'm not going again) my back tyre exploded. There's a 10mm cut in the sidewall - obviously caused by glass - and the tube had poked out and popped. I pulled out the tube (this is on the track bike, and I don't carry a spanner for the wheel nuts), patched the thankfully not-too-large cut and while that was drying found a Lambert and Butler packet in the undergrowth  to make a boot for the tyre. Reinflated with CO2 to a moderate pressure and heroically declining the offers of a local couple to use their home phone, rode off. I got within a mile of home before it exploded again as the boot finally gave up. Fair enough, I thought, and walked the last 20 minutes in my socks to save my cleats. I suppose I really ought to moan at the council - I've never seen anyone sweep a psychlepath in Swindon and the local yoofs do like to smash bottles on them for entertainment.  the advantage of puncturing in a council estate!