Well I did google search, and they do seem to be starting to grow grapes in England:

"It was not until the 950’s, 50 years after the Vikings were defeated by King Alfred, that vineyards where flourishing again in Somerset. By the time of the Domesday book (11th Century) there were 38 vineyards sited. In the 1200’s religious orders were using wine from the southern coastal areas of Kent, Sussex and Hampshire and Somerset, Gloucestershire, Hereford and Worcester. However during the middle ages cheaper imports from the continent put pressure on English vineyards. The remaining vineyards disappeared at the end of the 14th Century when a relatively warm period (thought to be 1 –1.5 degrees Celsius warmer than today) came to an end and the mini ice age set in. The vines didn't disappear completely but they did not become a commercial proposition until 1951 when the first modern commercial planting was at Hambledon Vineyard in Hampshire."

And eariler in article:
"Global warming may be scaring many people, but English winemakers look like one group to benefit. Some scientists predict that by 2080, the South East climate will be similar to Bordeaux. Already growers are attempting to grow the Bordeaux grape Cabernet Sauvignon in Gloucestershire, all be it in poly tunnels, normally used to assist the ripening of strawberries. But it is the scale of new plantings that show the industries confidence with over 120 Ha planted in the South East in 2006, it is York that was the surprise with the number of Vineyards in York increasing from 1 to 4."
http://www.thirtyfifty.co.uk/spotlight-english-wine.asp

But essentially I was correct, not quite there yet, but in a couple decades of time it could very well get warm enough.