Tesco's or Wilko's puncture repair kit, only a £1, I buy one quite often, mainly for the small tubes of rubber solution and buy patches off Ebay in bulk for just a few pound from Hong Kong etc. When riding, I always carry an unopened tube of glue as a back up to the tube in the kit, especcially if it has been opened as it goes off pretty quick sometimes as mentioned earlier, I once read, that you should never touch the inner tube with the tube as it starts off the curing process in the tube, since reading this, I have kept it in mind along with making sure no air is trapped in the tube and found it does increase the longevity of the solution.