If your children are at private school (day pupils)

[curiousbystander]

How much non school based extra curricular stuff and mixing with non privately educated kids do they do?

Mine get so much at their school but they do cubs in the village, it's sweet and cheap as chips. But for the main (music drama sports) we rely on school really- it's co-curricular

All our extra curricular is external, precisely to avoid ‘the bubble’. Three evenings and one weekend day a week.

Tennis and rugby clubs in addition to the school provision. At the pre-prep/prep level we also did Rainbows/Beavers and Sunday school.
It can be difficult with school days ending at 6.30pm and Saturdays.