Fancy taking in the fluid beauty of a Matisse? Tempted by the glorious technicolour of a Hockney? Intrigued to spend some time with a Dali? It may surprise you to know that you won’t have to travel to a major, central gallery and brave the crowds in order to enjoy these pieces. Sylvester Fine Art Gallery, in the heart of Belsize Park village, is a treasure trove on your doorstep.