New symptoms, or symptoms that will not settle, usually start with a GP visit at 117a Harley Street. You do not need a diagnosis before you arrive. Tell your doctor what has changed or what is concerning you.
Some people dislike doctor appointments, worry about examinations or blood tests, think it will be fine and see no reason to look for a problem, or would rather not know. You can book one visit, say what you need and agree with your GP what examination, testing or referral, if any, is worth doing that day.