‘he gets a feeling of urgency when he has to go and urinate, but he does not wet himself. The relevant descriptor requires that a claimant risks losing control of bowels or bladder, so that he cannot control the full evacuation of the bowel or the full voiding of the bladder if not able to reach a toilet quickly. Whilst [the claimant] may have some difficulty in this respect, there was no evidence that the problem is anything like so severe as to satisfy that descriptor. We do not accept that it is satisfied and he does not score any points for the activity of continence’