Welcome to MHF. Yes a must to join Caravan Club and Camping and Caravan Club. Prices vary, depending on time of year, and how many people, i.e. pitch/adult CC. As you are intending travelling end July, that of course is in the school holidays, and I would certainly look to book as sites get booked up fairly quickly, a look at the sites on the net will give you a guide as to availability. Happy travelling.