@Philip_Britton Tweet 25/07/2016 05:41 PM Tweet 25/07/2016 05:41 PM Posted by Bolton School on 25 Jul 2016 Modified by Bolton School on 15 Sep 2023 @Philip_Britton 10 hours needed for most of year 7 to 9 - food for thought about bedtimes twitter.com/tedtalks/statu…