Here are some useful links as published in the principia Education Resources booklet by ESA.
Into Film – a site which offers activities fir 5-19 year-olds
Rocket Science with the RHS – a chance for schools to grow seeds which have been in space
Three Minute Learning – an online literacy resource.
Space Diary – a chance for children to make their own space diary
Tim Peake – Space Science Show – an interactive Space Science show.