Cambridge Head Office set a Recommended Retail Price for counsellors as a guide, however, it is just that recommended. By law they cannot tell counsellors how much they can charge for the packs as counsellors are self employed individuals not employees of the company.
A lot of counsellors, myself included, stick to the RRP others charge differently. Some deliver, some give extra counselling, some round up prices, some rent out premises so have more overheads.
The best thing to do is contact your local CDC's and see what they charge and what they offer.