I had a couple of roadside flats (700 x 23) recently within a few days of each other. Previously I went for months without a problem. Both time i was quite late for work, absolute nightmare to fix and had to walk back home twice in defeat (1.5 miles).
I couldnt keep letting this happen so I splashed out and fitted Scwalbe Marathon Plus (700 x 25) hopefully I wont get any more problems for a while.