Many thanks everyone. We have decided to pull my two youngest children out of school from Monday and my older teenager will board with a friend.
Unfortunately my husband is very high risk of exposure (medical) so we are both really struggling with how to manage this, both psychologically and practically. At this stage, if he shows any sign of becoming unwell, I will go into full lock-down in the bedroom for a couple of weeks. It's so hard when we have up till now had help from grand-parents, but we are also trying to keep them well. This is really rough but I know I'm not alone. Thanks for this wonderful community.