Have you been referred for specialist care ? If so you are entitled to a choose which hospital of specialist team will care for you. You may have this discussion at the time with your doctor or with the booking clerk when you ring to make your appointment. for more information on choosing a service please go to the Choose and Book NHS website.
You are not limited by geographical area. If you work away then you may find it eassier to provide a hospital provider near to your place of work.