Taking part in the study will involve attending 2 extra hospital appointments:

• An initial screening visit to consent to the study and to check that you are eligible, (this visit may be combined with one of your usual visits)
• A follow-up appointment a year after your procedure
• You will also need to fill in some questionnaires prior to your procedure and then again at 6 weeks, 6 months, 1 year, 2 years and 3 years after your procedure.  The answers to these questionnaires will help us to find out how effective your procedure was.  As a thank you for your time, you will receive a £25 gift voucher on completion of questionnaires at 2 years and 3 years post-procedure.