Yeast Family Tree: Help, Please

Detail from a 1912 brewing log: Burton No 1 Yeast.

We’d like to put together a yeast family tree showing the relationships between the varieties of yeast used by British breweries. We know, for example, of a couple of breweries using yeast originally derived from the Shepherd Neame house strain.

We picked up a few tips in the comments to this post, and will be rooting around for information ourselves, but any information you can give us (especially if supported by links to evidence) would be gratefully received.

Where you know this is commercially sensitive information (i.e. the brewery doesn’t want people to know!) then it’s probably best to respect that.

Alternatively, if someone’s already put such a family tree together, let us know where we can find it.