The main ones- and I mean main ones are Word of Faith Christian School (Now known as Willow Academy) and Harvest Christian school. I attended WOF and in terms of Christian schools, they are alight. I think they have reverted to a Christian based system similar to PACES (I think that's what they are called). Harvest, to my 2 year old knowledge,uses the Cambridge system.
For preschool I dearly recommend Noah's ark. They are the best and run an annual production with the kids that in my opinion is a "wave at mummy and daddy" show. about 8 years ago