I'm not booking anything in advance during 2020.
Fortunately we were tardy in getting around to planning the Canaries for Easter, so we booked a cottage in Wales instead... we now have our money back. Less stressful than dealing with a foreign holiday.
The only vaguely reasonable chance I see is possibly last moment camping in the UK, but I'm not holding my breath on that either. There won't be touristy attractions open anyway.
Other than visiting family, I'm in no rush to leave the UK in 2021 either.