The Caravan & Motorhome Club in the near future are going to introduce deposits, hopefully this will stop the weekend blockers who multi book and decide near the time which break they want to go on.

https://www.caravanclub.co.uk/faqs/uk-booking-experience/

"A deposit will be calculated for each individual campsite stay within a booking and will usually be 20% of the total value of each stay. If several different campsite stays are booked together within one booking, one payment will be taken at the time of booking to cover all the applicable deposits of all the stays combined. There is a minimum deposit value of £25 per stay. However, if the total price of the stay is less than £25, then the total price will be paid as the deposit.
Deposits will only apply from when the new UK booking experience is launched (sometime in 2022) and will only affect new bookings made after the launch. Up to then continue to make bookings on the existing system (which do not include deposit payments)."

I can see there's a benefit in this. However the reason I have stopped using CCC is because you have to pay a deposit which you lose if you can with - I think - less than 30 days notice. Sadly health reasons mean we often have to cancel at quite short notice - but never later than the Friday before arriving on a Monday.

CMC is applying a 21 day rule - may as well bloody give now!!!! Ill health is something that cannot be predicted especially with chronic conditions that flare up at no notice. Thanks a bunch CMC.

I am not sure this will pan out but they do mention short notice due to illness.

What happens if I cancel due to illness?
The Club will sensitively manage cancellations due to exceptional circumstances