Caro, what I usually do with roast lamb is to eat roast on the night then a lamb curry for dinner the next night.
Just cut it off the bone in chunks and toss it in the slow cooker with some potatoe, carrot, peas (or whatever you fancy) and the curry mix of your choice (I like the pataks korma at the moment - it's quite mild) and cook until the veges are done (about 3 hours on auto in mine). Serve with rice and natural yoghurt (with fine sliced leb cucumber and finely chopped or mashed oregano and/or mint).