I usually have no waiting list and, depending on your availability, can usually see you in the same week that you get in touch or the following week. I believe that it is important to get started promptly after you reach the decision to reach out and make a change.
Many people seek out private counselling after realising the length of NHS waiting lists for Counselling. If I cannot see you promptly, I will refer you to another therapist who can (somebody I know personally and can vouch for).