I went to get on my bike to cycle home only to find I had a flat front tyre 
What a bummer that was after extoling the virtues of my Kevlar lined tryes. Thankfully I’m a bit of a dab hand when it comes to changing inner tubes and I was fully kitted out with spare tube and CO2 inflater thingamyjig so I was quickly back on the bike and homeward bound.
The reason for the puncture?