I owould suggest going and looking, and speaking to the head teacher, with a number of schools local to yourselves, both private and state. See what you think.
School fees will differ from school to school and area to area. The prep we have DD's name down for (although she may now not go there - hoping to move to good catchment instead) is around £1800 a term (approx £5500 a year). This includes a breakfast club and after school care, all activities, including French, Ballet and Swimming, music tuition, SN or G&T assistance, all food and snacks, etc. Obviously there are other extras such as the uniforms ( summer and winter, coats and hats, ballet kit, PE kit, etc.) and school trips. But luckily astill nothing like te £70K Carla is looking at. This is in Sheffield, and it is one of the more expensive preps round here. Class sizes are very small.
However, class sizes at one of the other prep schools here, class sizes are large - up to 25/26 in a class, which did suprise me for a prep school.
Regarding the reading - this is likely that the teacher may not ehar every child read daily. However, there are normally parent helps and classroom assistants who help with tthis, and is some schools the older children also do paired reading with the younger ones.