New chain on my fixed, cleaned the winters accumulated crud of the places its difficult to reach, and whilst I was doing that I changed the chainring, put a 46 on to replace the 44, gives me 68 inches instead of 65, added a half link to the chain to get the chain length where I wanted it and adjusted the rear brakes to take account of the different wheel position. Whilst I was working on the bike I had the front wheel off tyre tube and rim tape off and debured the spoke holes where the tube was damaged, The flat tonight was two small holes, pin pricks, rim side about a half an inch from the valve, some sort of damage to the tube, though I'm not sure what caused it, I debured the spoke holes just incase, the rim tape is in good condition and the spoke holes looked OK.