Ladder, window cleaning type (Higher Bebington CH63)

Window cleaning type ladder. The photos are just to show the kind of ladder I need & it doesn’t matter whether it is wood or metal. It can be quite small (about 8 feet would be perfect). I have built a living roof on my garden shed & need this kind of ladder to be able to safely climb up & access/maintain it. I can collect. Thank you for reading this message.