The Hook Norton-owned pub won both categories of best refurbishment and best conservation. The historic, listed Gothic castle of the mid-1740s was designed by architect Sanderson Miller.
It is situated on the site where King Charles I’s standard-bearer planted the royal arms before the first battle of the Civil War of 1642 and has been a prominent landmark for three centuries.
A second refurbishment award was given to the Old Bridge at Kirkstall, Leeds, which is the brewery tap of the Kirkstall Brewery. The pub was given the accolade after retaining its Victorian features during a contemporary makeover with beer and brewery memorabilia which has been salvaged from other closed pubs.
Two venues in the 'conversion to pub use' category were given highly commended awards. The Network Rail-owned Harrogate Tap at Harrogate Station, North Yorkshire has had half a million pounds spent demolishing extensions, re-roofing the old brick building and renovating the interior.
The Wallaw, Blyth, Northumberland, was given the second award after the former 1930s cinema was converted to a pub by J D Wetherspoon.
Vision
Sean Murphy, judge and competition organiser, said: "The pub design awards celebrate the architects, designers and pub owners who have the bravery and vision to go above and beyond when restoring, conserving or designing pub buildings.
"From the preservation of ornate Victorian features in Leeds, to the sensitive restoration of pub in a gothic style castle in Oxfordshire – the Pub Design Awards recognise the importance of fantastic design in pubs across the breadth of the UK."