It’s a while since I’ve wild camped so not sure if the status has changed. When I did it was more ‘accepted’ than ‘permitted’. Also, the good spots are closely guarded secrets, so you’re mostly on your own there! I don’t know you’re experience, but for anyone else thinking about wild camping: You want water relatively accessible and depending on the weather, some shelter. (I’ve always drunk from fast flowing streams, never pools and survived without treating the water. You also want seclusion as you really don’t want to be getting any attention from walkers or land owners.
This time of year you won’t be getting much sleep, so decide if you want the evening or morning sun - I prefer the morning sun as it dries any dew off my kit. Looking at the map you should be able to plan a route and spot some quite nice spots if you think about the above. Only spend one night in a location.
I used to leave work early, drive down, get half a walk in, a night camp, finish the walk and be back to work for 9AM. One memorable morning was waking up on top of one of the Carnedds.
My preference was always to bivvi rather than tent as it was easier to carry and far easier to find a hidden spot. - The pleasure, as with most bivvying is generally retrospecive, but great fun. Pitch up at dusk and leave at first light, leave no trace bar some flattened grass and all is good. - Just make sure you pack enough calories and water.
The first wild camp I ever did was on the side of Tryfan in just my sleeping bag on a clump of heather. It would had been perfect if I hadn’t put my hand in goat muck earlier in the evening. - Took two days to wash the stink out.