DSD and her BF have come to stay this weekend. We also have DD and DSS and me and DH at home, so that makes 6 of us. DD wants her BF to stay over tomorrow night. I can't figure out whether that's allowed or not. It would mean 7 people in the house, but in no sense would we be "gathering" DD and her BF would get in late and go straight to her room. Rest of us probably we wouldn't even see him. Is that allowed? Or are people considered to be "gathering" simply by being in the same house? We're in England by the way and not in an area with any local lockdown