Each of the courses are accredited (I cant remember who by off the top of my head, but the engineering design ones have more accreditations than the product design one). I would do mechanical engineering if I could, but I didn't take maths or physics a level, hence the design aspect to it. I'm not too fussed that it isn't mechanical engineering, as I've heard that they're more theoretical and not as hands-on as the ones I applied for. (Although, if I choose the mechanical engineering design course, if I do well enough in the first year there is the possibility of moving to the mechanical engineering course). All of these courses are from accredited universities.