Reddit mentions of Jane Grigsons English Food

Jane Grigson's English Food (1979) is probably as close as you'll get to an English Mastering the Art. It's as much a history and anthrolpological study of English food as it is a collection of recipes, but its recipes are extensive and excellent.

Elizabeth Luard's The Old World Kitchen (1987), which ranges across the European continent, nonetheless contains a fine, idiosyncratic collection of English recipes in its midst (and is probably the best single-volume reference of old world peasant cooking traditions).

The incomparable Elizabeth David's English Bread and Yeast Cookery (1977) covers every inch of the English bread-making tradition, from milling wheat to presenting at the table. David's attentions were usually focused in a more southerly direction -- the foods of France, Italy -- but she treats the baking traditions of her home nation with as much detail and respect as she does those of more foreign locales

If you want a more contemporary, chef-y book, check out Fergus Henderson's more recent The Whole Beast (2004), which is delicious, detailed, and delectable.

And finally, if you want something a lot more chef-y, Heston Blumenthal's The Fat Duck Cookbook (2009) will show you contemporary English gastronomy at its most ambitious (but also, maybe, its most pretentious). It sure is pretty to look at, tho.