Radical Brewing by Randy Mosher has a Welsh Ale Recipie predating the encyclopedia by 50 years. It includes molasses, pale malt, Kent goldings, and English Ale yeast. I don't know about copyright restrictions for posting that recipe, but it is on page 253 and the book has a bunch of great info. The book says prior to the 1800s Welsh Ale was a type of Bragot.
The book can be found on Amazon.