“It is not just about higher temperatures, as the weather is getting more extreme in general,” says the 31-year-old.

“We get more late frosts and [then when it gets hot], you have to keep the leaves in place on the vines for longer to protect the grapes from the sun.

“I also have some friends now who have to irrigate, and others experimenting with grape varieties from hotter countries.”

Wine journalist Jamie Goode, says that when it comes to climate change “there are few winners and many losers in the wine world”.

“Part of the problem is that grape varieties only perform well within narrow climatic parameters, and it takes many years to change varieties and begin getting good quality grapes.”

Echoing Ms Swan’s comments, he adds: “There are increasing problems with extreme climatic events, too – this is part of the chaos of climate change.

“Warmer springs encourage vines to bud early, and then they are at risk of frost. And hail is a big issue in many regions, and causes extreme localized damage. It is the increasing inconsistency of weather patterns which makes it hard for winegrowers to adjust.”