You might want to start a new thread @Jo620 , as folk with an opinion on the subject might not be reading this OLD thread about sprucing up!
Personally, I haven't stopped hosting since the start of the pandemic, but always within the law! I've continued to host (via Airbnb & SpareRoom) - doctors, nurses, pharmacists, carers, social workers & engineers in essential services! - All of whom were working here far from home, & needing overnight stays, or several.
There have been other recent threads on the subject of The Vaccine, and whether we can/should enquire?
Certainly the LEGAL position in the UK, is that we are not allowed to host frivolous stays, for tourism or visiting friends & family; rather we are only allowed to host stays for work, moving home, & funerals. The gov.uk website gives the details. If you look at any UK listing, you'll see a banner saying that travel is illegal except in certain circumstances.
As regards opening up the calendars, I guess some hosts are taking bookings for summer in the hope the ban will be lifted, & some will wait until it IS lifted, to avoid the headache & hassle of cancelations...?
https://community.withairbnb.com/t5/Host-Circle/Checking-that-guests-have-had-the-Covid19-vaccinatio...
https://community.withairbnb.com/t5/Host-Circle/Hosts-amp-Vaccination-Requirements/m-p/1405422