Friend Carolyn B., who lives in Welwyn Garden City, sent this charming retro card of an old advertisement for the 'new town'. Founded in 1920, WGC is about 20 miles from London. Nearby Letchworth Garden City, the first garden city, is also home to Britain's largest colony of black squirrels. It also has muntjac deer. Some years ago while driving back from Letchworth, we saw one scrambling up a roadside embankment.