Agree re headxteacher: vital and many are not as good as one might wish: the best are born, not made, and I speak as an ex teacher and school improver.
Education is vital in the early years. if a child arrives at school with no experience of stories, rhymes and family discussion, it will be really hard for them to catch up. Sadly, if you're poor or trying to deal with issues of any kind of deprivation, you lack energy and brain space to read/chat/sing with your children. The best intervention is as early as possible, even in the cradle. Sure Start was a great development under the last government, but cuts have meant councils cannot provide as they did.
Not convinced by the French trip either, may do more harm than good. May be better to provide more opportunties to work in teams, debate and raise self esteem through small steps.
Complex issue, no easy solution, I'm afraid. Differences are made through hard work on the part of teachers and family liaison. That's hard and costs money.