I wrote some emails to James Spencer from basic brewing radio about my experiment with wild yeast. I went back and found what I'd written. Here's my conclusions.
"The wild yeast started, the starter bottle swelled up there were signs of fermentation in the bottle. I opened it to take a smell, very interesting fruity aroma, similar to that of the Safale wheat yeast. But the bottle didn't swell back up after that. Fermentation had finished. I gave it a little taste, it was quite interesting and very fruity, but still sickly sweet. Obviously the alcohol tolerence of the yeast was very low and it couldn't ferment any more. I've repitched it to a larger starter and this time measured its initial gravity so if it starts back up atleast I can see what its actual alcohol tolerence is. However I doubt the yeast will be good for anything but ultra light beer. "
So my memory was wrong, it did taste ok, but it had very low alcohol tolerence, and useless for brewing.