All FPP cadets on last years intake had to do a BA Cadet Medical at Waterside and I'd be surprised if they didn't do it again. This was in addition to the standard Class 1 and was the last hurdle effectively to getting the final nod.
That said, if you can place one foot in front of the other, pee in a cup, pass a standard eyesight check and have a chat with a doctor about your general health then you should be able to pass it without any difficulty whatsoever.