The limited-edition Ascot Tercentenary Ale is available nationally in Budgens, regionally in selected supermarkets including Waitrose, and Ascot Racecourse itself. Only 30,000 bottles will be produced.
The 5% abv beer is bottle conditioned and brewed with hedgerow Sovereign hops.
Sales director Richard Fuller said: “There are not many racecourses that could celebrate a 300th birthday, so we are delighted to help Ascot Racecourse mark theirs.
“We are very proud of our heritage and would like to think of this partnership as a bit of a nod from one truly English icon to another.”