I should have said, we have done Butlins before at Skegness but we have never done CP. So we know what to expect from Butlins! 
Butlins did surprise me though - I thought it would be loud and brash but actually it wasn't! Or maybe because we're not judgemental and quite down to earth people and are accepting of all walks of life PrimaLass
School dinners - hmm, matter of opinion. There is 2 dining plans and we went with the premier one (inside the big tent opposite Burger King) which is seemingly more up market than the other one beneath the red coats building.
We have a DS aged 4 so fairgorund rides, shows etc is appealing because what makes him happy, makes us happy. The pool, like at CP, is also free but judging by the maps etc does seem larger.
DH has said he doesn't think he would EVER go to CP due to the price and the little that is included despite the huge swimming pool. His boss paid £1500 for 5 days and 4 nights which lets face it, isn't REALLY 5 days because you can't arrive until after midday and leave before midday at CP, which I know is the same at Butlins. But £375 a night is extortionate! A little bot more and you can actually have a 2 week holiday abroad and have it AI too! That's not to say I would never day never! CP intrigues me and I am the sort of person who likes to explore and find out 'what all the fus is about'! But I doubt I will ever go with DH!
Thank you so much for your replies. It is, seemingly, the consensus that MNetters tend to go to CP and dress their kids in Joules and Boden (love Joules, but expensive, no opinion on Boden as never seen Boden clothes!) and are quite judgemental of people who do go to Bultins and maybe even Haven.
But we have decided to go to Butlins. Thomas The Tank, Fireman Sam and other well loved characters, swimming, as much food as we can eat, fairground rides, soft play, soccer school and loads of other activities such as animal encounters and a beach! Butlins it is. My 4 year old LOVES activities, and we love how they are included with the price and when they're this age, it's all about them!
CP - one day! 