Fountain Heads: old-fashioned milkshakes and floats are back, this time with grown-up ingredients

Summer’s the time to revel in childhood eating habits, and at the top of the naughty list are awesomely junky milkshakes and floats. A recent mini-resurgence of old-fashioned soda shops and diners inspired us to taste-test the city’s most delicious ice cream concoctions. Here are our favourites.