And I thought day one was good... I found a nice Autovac, very cheap. Too small actually, but the lid's in perfect condition, so are the internals, and there was really nice original push-pull tap on it which is worth having too.
And then at the very last stall - and I visited ALL the stalls - I found a CE6 magneto. I could not believe my luck. And he wanted a VERY reasonable price for it, and it had a fair spark.
Now admittedly it's the wrong rotation because it came off an Alvis, but that's no problem it can easily be reversed. I reckon it was the bargain of the day.