Best parks for young families in the UK?

We've got a 4-year-old and a 2-year-old and we're looking for recommendations for caravan parks that are genuinely great for young families. Good playground is a must, ideally a pool, and somewhere where we don't feel like we're disturbing people if the kids are being... well, kids. Any suggestions?

Haven sites are honestly brilliant for that age group. Yes they're busy, yes the entertainment is a bit cheesy, but for young kids they're perfect. Multiple playgrounds, pools with splash zones, kids clubs. Hafan y Mor in North Wales is probably the best one we've been to - the adventure village alone kept ours entertained for days.