What reading level should a 7/8 year old be at?

[hannapanna]

We're moving to England in 7 months time. We speak English at home so the kids (7,5,3) do speak English well, but have been in French speaking school so don't know how to read and write very well. So I'd like to boost there English a bit so they aren't too behind. I'm not so worried about the 5&3 year olds but at 7 it might be more of an issue.
So what reading level should my son be at? He will be starting 4th grade when we move.
How often do your kids read? What kind of books?
Any recommendations on good books for 7/8 y old boy? Il be in England in Nov so could get him a few books to bring back and practice with.

My 8yo is an advanced reader but still daunted by most chapter books - he loves Asterix, anything Star Wars, and has read Mr Majeika and Flat Stanley and loads and loads of Lego, Star Wars and Minecraft magazines.

I would try watching DVDs in English and turn on the English subtitles. And put subtitles on the TV once you move - it's really helped mine recognise words.