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So one puncture that you didn't fix properly ;)
I hate that. I always take more time than most people with flat repairs because there's NOTHING worse than riding off and 100m down the road having the tyre go flat again, because actually there was still shit in the tyre. I always run my fingers around the inside of the tyre to find any sharps. The odd inspection would help too but it's hard with mudguards on.
Did you ride through a kilo of glass? What sort of flats? What sort of tyres?