Current parent of DD at Surbiton and it's certainly NOT 240 in each year group. Where on earth did that come from?!
DD is in Year 9 and there are 144 girls in her year group approx. It could be up or down from there like 142 or 146 - but they don't go above 25 ever in each class. It started out as 144. She's had as low as 22 over the years and I think now it's at 24 again.
The year below her I think they over offered so have 7 classes - so that's 168 approx.
current year 7 I'm not sure.
I'd call after half-term and ask to speak to someone in admissions if it's a worry.
It's a lovely school and DD very happy there. It's run by United Learning which is also runs Guildford High for Girls.
The pastoral care is excellent. Of course you'll get others who say different things but I love the school and so does DD. Not a hot house crazy academic affair but quietly on the ball all the time and very responsive.