My kids came over to the UK from NZ when they were 12 and 14.
I think it's fair to say the educational experience wasn't as enjoyable, nor as relaxed as the NZ one. They found the noise and chaoticness really hard to deal with, as well as the fucking stupid rules like having to ask permission to take your jumper off, that sort of crap.
It's a lot more learning by rote, and reminded me of pigs being fattened for market - forcing in as much information as possible.
On the other hand, the teachers, in general, were fantastic - really engaged and incredibly willing to go the extra mile to help a willing and able student. They're as much prisoners of the system as the kids.
I think my girls got a far more extensive and thorough education than they would have in NZ - in the sciences for example, DH said they were doing stuff more like first year Uni in NZ and well beyond what they would have been studying in the equivalent year.
GCSEs, the number of subjects and exams is bloody ridiculous.
I roll my eyes when I hear politicians etc wondering with faux concern why so many kids are suffering crippling anxiety and other mental health issues, and why there is so much absenteeism.
One thing I fiercely resisted, was pressure about the kids being off sick, and to send them to school whether they were sick or not. I get it, the school's concern is the kids' education, and their stat's for Ofstead. My concern is for my child, their education, and the whole child.