I'm not sure we will easily have another national lockdown, the various nutters on the Tory backbenchers don't sound like they will be keen on much of an extension to measures.
Maybe just stck a Tier 4 option and leave local measures in place (assuming the Tories will even back that).
It would be remarkably typical of this government to completely fuck things up with the finishing line coming into sight.
London should be in Tier 3 at the next review, numbers here even under lockdown are trending up, will be interesting to see if they have the balls to do that. If they don't and leave London in Tier 2 for another 2 weeks plus the Christmas loosening things will likely get pretty bad here.
A lot of the areas that weren't in Tier 3 pre lockdown aren't trending too well.