I have a 26 mile round trip through central to north London. it's like riding through a mine field of shrapnel some days! My road bike has new Gatorskins, and my CX bike is riding Specialized Borough CX's. I always carry a spare tube as I really can't be bothered repairing them on the road - I also carry one of these http://www.btwincycle.com/EN/sealant-17135942/ which inflates and seals at the same time (great if it is raining!). The 2 times I have had to use them, once got me the remaining 10 of the 13 miles home, the other inflated and then stayed that way for 3 months until I remembered to change the tube.