How to get started on physics for kids?

I am in UK and my kid (8yr old) is interested in space and physics. So far, the interest has been kindled only by myself. Here, primary schools do not focus much on science and leave it all to high school (11+). I would like get started much earlier. What would be the best way to encourage that? I don’t want it to feel dreadful. But want to have some structure. Any good ideas? Will online tutors help?