Before I get slated for the mere idea, it's Summerhill I'm thinking of, not some selective or snotty public school. I am not cut out to home-ed. I think Summerhill might very much suit DS1.
Summerhill has 3x11 wk terms. DS would be home 19+ weeks a year (aack!). His friends from primary school would still be in school about 9 weeks a year of that...
So, big question is:
How do boarding school children fill the time at home? We wouldn't be able to much ferry DS around the country to see his school friends.