I'm part of a (legal) support bubble that crosses tiers - I'm in Tier 3, and my support household will be in Tier 4 from boxing day. As I'm freely mixing with people living in Tier 4, does this mean that I should be acting as if I am as well? I go to very few places and see very few people anyway, but I'm wondering if I should now limit interactions with others even further. No guidance on this that I can see online - what are others doing?