Islington’s Twentieth Century Posters, which specialises in rare original British posters, prints and ephemera, is having its annual stock clearance sale this August, meaning it’s your chance to pick up a bargain. The once-a-year sale is the team’s way of making room for new posters and you can expect to find discounts ranging from 20% right up to 80% on a variety of rare posters, which range in age from ten to a hundred years old. The gallery can also provide restoration and framing services on demand too.