A proposed law to force British embassies around the world to buy and serve English and Welsh wines instead of Champagne, Prosecco and Cava is being introduced in the UK Parliament.

Ms Ghani said “lack of consistency” meant the Diplomatic Service was missing opportunities to promote British produce abroad to nations such as India, China and Singapore, as British wines are already served by the Queen and the Prime Minister at official functions.

Figures from the UK government’s hospitality cellar show that more than 350 bottles of English and Welsh wines were opened at official functions in the 2015 to 2016 tax year.

English wine opened at official receptions included Ridgeview Grosvenor Brut 2009, Breaky Bottom Brut Reserve and Camel Valley Brut 2008. Ridgeview and Chapel Down are the official wine suppliers for 10 Downing Street.