The puncture

On my way home from work on Friday the bike was feeling a little weird, turns out it was a puncture as I discovered a very flat tyre today.

I removed the wheel and got the tube out. Patched it and put it back in only to hear a lovely stream of air at the valve. The valve was looking nasty, all corroded and obviously I did something when I was struggling to put it back. I haven't even take the tube out again. I'll just take the whole tyre in tomorrow and get them to replace the tube. This is the offending bit which caused the puncture:

Hopefully that'll get sorted out tomorrow and I'll be good to go for another while.