Hi it just depends where you live what area. My daughter did the northern associates for a few years before going to vocational school.
It's fabulous and three levels, they don't go off age they go more off ability, my DD was in seniors at aged 12 and it really pushed her.
Cost was around £170 per year you can pay in 1 go or over the 3 terms.
Northern is based in Warrington not far off the M6, based at KSD
I don't think all the kids who attend are studying cecchetti method.
Hope this helps x