Teaching materials for ESafety abound for Key Stage 2. A google for videos and lesson plans for Esafety will display links and links of materials that you could easily slot into a Year 5 or 6 lesson. But, things are bit more tricky for younger year groups.
Take a look at Lee and Kim and the “dangers” they encounter online, including some rather alarming singing super hero guy!
Oh and by the way make sure teachers know exactly which CEOP video they need to use as most of these are suitable only for older learners.