I didn’t actually go to school in the UK, I was living in the US through school. But I’ll give it a go.
Yes, I went to preschool and it probably would have been around 3, possibly 4. I was a “September baby” so the youngest in my year, so probably would have been closer to 4.
We had the equivalent of like EYFS at 4/5, so yes, but very play based. Proper sitting at desks looking ahead at the teacher school would have started around 6.
I don’t consciously remember swimming lessons in primary, but we must have had them. I remember being bussed off to bowling and dance classes for PE, so we must have also done swimming. I had to pass a swimming test in secondary school.
Our primary residential was to like an outdoor education centre. We learned about the wetlands and we had a school disco in the evening. 😬
I did go on a European residential in secondary school, but it was optional and, as you’d imagine, very expensive. Probably like £2000-3000, which was a hell of a lot in the 90s. We went to the UK, France and Italy and it was like 2-3 weeks long. The equivalent of the ski trips to Canada that some schools take today. No idea how my mum afforded that.
No, any snacks at break times we had to bring from home.
Prim school we had to bring packed lunches and secondary school was hot meals (actually they were quite nice!). It was a set cost per day and we would have been billed at the beginning of the term along with any other things, like school trips or equipment for photography or art class or whatever. I remember bringing in a cheque for it.
We did have standardised testing like SATS in both primary and secondary, plus other exams for university admission, etc. I remember my hand cramping filling in all the bloody little bubbles on the answer sheets. 😩