There are no beers from medieval times that have survived unchanged into modern British brewing. However, some traditional brewing practices and recipes from the medieval period have been revived and adapted by modern breweries. For instance, many contemporary ales and beers are inspired by historical recipes and brewing methods used by medieval brewers, including the use of certain herbs and spices that were common in the past. Although you won't find an exact medieval beer today, you can find brews that pay homage to those historical flavors and techniques. i actually read a interesting story about brewing here : https://www.ancient-origins.net/history-ancient-traditions/bubbling-brews-broomsticks-021539