Check out Mrs Beeton's All About Cookery, you will be able to find lots of old British recipes for almost everything. It should be available online for free!

One of our regulars (/u/Gollygoshdarnscurvy) has a food blog that you might find interesting. The Cornell Hearth collection of digitized home economics materials should also be interesting to you, but it is focused on 19th century American texts.

The Project Gutenberg cookbook shelf has a wonderful variety of specifically English cookbooks. Besides Mrs. Beeton, some others of particular interest are The Forme of Cury, English Housewifery, The Queene-Like Closet, and The Closet of Sir Kenelm Digby.

Edit: Dagnabit, I was just going to edit in a recommendation for Medieval Cookery! The Book of Kervynge has this glorious list in it of what you should appropriately call carving each and every food animal. Useless for recipes, but just fun. For later Victorian, I like Things A Lady Would Like To Know.. It has some great sexist sermonizing in it.

Check out Dorothy Hartley's Food in England, 1954.