Thank you CTBarrister for your clear reply.
Yes it will be a colorectal surgeon in St Mark sometime in September. I do hope that I will not have any weakening of the anal sphincter though! He told me I might have to use once back home a metal piece which will help to keep the dilatation open, few minutes every day. I am not sure where the need of dilatation is exactly but I feel it is pretty close to the cuff.