In reply to Tim Davies:
Some are open, most require booking and payment in advance and no refunds, and best to check in advance anyway as some may be calling the season's end, or have other restrictions in place to manage the covid risk as best they can. A few that I know have been open for tents:
Durness (but reluctantly), Port a Bhiagh, Dornoch, Roybridge (limited numbers), Sand, Braemar, Cannich (limited numbers), ?Lochcarron (unsure about this one).
Post edited at 15:27