Prince Charles sampled vodka and gin during a visit to Ramsbury Distillery last week.
The Prince was given a tour of the facility, where spirits are distilled from wheat grown on the 19,000-acre Ramsbury estate, owned by billionaire Stefan Persson, owner of the H&M clothing chain.
The prince is patron of the Prince’s Countryside Fund, which was founded in 2010 and provides up to £1.2 million in grants to British farmers across the countryside.
Later, the royal headed to a reception at The Bell Inn at Ramsbury, which is also owned by Mr Persson.
A distillery spokesperson said: "The relaxed visit gave our team an opportunity to demonstrate how we put sustainable farming methods into practice to produce the highest quality products.
"We were delighted to showcase our ‘of this land' principle with a walk around the Estate.
"Our brewers explained how the heat generated by a wood chip boiler is fed by our own sustainable woodland, our livestock are fed spent wheat from the distillery and by-products from the oil press and how waste water is cleaned by a wildlife friendly reed bed system."