happened to me one time in four years, almost certainly because I hadn't put it in right, they're a tenner a throw anyway and much better at pumping up than any other pump I've tried
we have potholes in london if that what the Portsmouth remarks are about, you have to have the right length for your frame obviouslly, mine is a very snug fit
or if you mean nicked, I don't leave my bike anyway where the proles can finger it
me too re spare tube, I used to fix roadside but my eyes aren't up to seeing the hole anymore, I fix them in the kitchen now with reading glasses, music, a cup of tea and a frame pump
or it if happens on the way to work: reading glasses, a smaller sink and the aforementioned frame pump