Anyone who's interested in brewing historical British beers will find this book of interest. It's not a history of beermaking, but a book of recipes--so it's mostly of interest to homebrewers. It has recipes going back to ca. 1300, which is pretty exciting for anyone looking to make really old beers. However, the number of really old recipes is very limited. As many historical types are aware, beer used to be bittered with various mixes of herbs (called gruit), rather than hops; unfortunately there are only three gruit ale recipes in the book. Still, that's not too bad considering how difficult it is to find really old beer recipes.
The book's recipes are sized at one-gallon batches for ease of experimentation, but can be scaled up to a standard five gallons very easily.
If you can't find a copy to purchase, email me at lordpeyre at yahoo.com and I'll see what I can do. It took me the longest time to find a copy myself.