Puncture status update!
This morning I left for work and felt a bit odd, probably the home brew stout I thought. Then 50m later the warning light was going and reading 2.4 bar at the back. So I turned round and went back home. It was the same puncture! So I got in't car and went to work to read about home brew.
Just fixed it with another of those amazing puncture thingies Rae put me on to. Took it out and it's sealed up nicely. I've still got loads of wear left on this tyre so cross ALL FINGERS.