Lucycampcat - got back from Pear Tree yesterday and loved it, in fact we booked a week from 19th August.
Don't know how old your LO's are, but ours are nearly 7 (in fact it'll be her birthday when we go there) 4 and 3. They all enjoyed it especially the play park, which is one of the best I've seen on a campsite. Big section for ball games, football etc and then a good range of play equipment from baby swings/toddler climbling/sandpit to bigger swings, large garden drafts, but most importantly as far as mine where concerned two large trampolines. It is all clearly signposted only for 12 and under, no teenagers, which for us was reassuring, but I guess if your's are older would be a bit tough.
The only slight downside was that the play park was at the front of the site, so not visible from the pitches, although no danger of getting onto the road as a large hedge. They say that children are the responsibility of the adults and that an adult should be in attendance if they are under 8. However there is also CCTV on the playpark. We started off going with them, but they soon made friends with some other children and wanted to go off alone, so with the proviso they stuck together and looked out for the little ones I'm afraid we let them go. There were others without parents in attendance, so we were not the only ones and had no problems.
The site is very well run, lots of slightly officious signs, loos/showers great and shop was small, but had the basics. The staff were very friendly and printed out directions to Tesco's for us and gave advice for which beech to go to etc.
We went to studland bay, which was wonderful - it's National Trust owned so parking is a bit pricey, but luckily for us we're members so didn't have to pay £6 I think.
There's lots to do in the area, so I think you'd have options if it's a bit rainy.
Honestly I think you'd have a great time.
Do you know your pitch number - I've got a map still in the car and could let you know if it's a good one.