My one beef with Ian Dunt's assessment isn't to do with medical science but behavioural science.
Parts of the northwest have been under restrictions since the end of last July. Restriction fatigue runs the risk of the spontaneous break down in compliance anyway. If we have restrictions we have to have public consent for them. They can not be enforced on a public who have burnt out from them. Otherwise you run the risk of civil unrest (which may include merely widespread civil disobedience).
In some respects I would argue we are in a position where we have no choice but to roll the dice for that reason. There are parts of the country which REALLY need a break.
This then gives us the option, should we need it in dire circumstances, to reimpose restrictions. I would argue that in that scenario we would get higher compliance than if we just plough on as we have been.
People I know who got a 'restrictions reprieve' just before Christmas, seemed to fair better than those stuck in restrictions pergatory.
Again in this sense, because of the behavioural implications I would argue that continuing with low level restrictions could be counter productive and be a gamble in its own right in the event we get a variant type spanner in the works.
Indeed Whitty has said that he does expect Covid to throw up one last surprise between now and next Spring, so if that is in his conscious, I would imagine that this concern is factored into why they have made the decision they have and rolled the dice.
It is scary. It is on a knife edge in terms of how this could go.
The point here is we don't have the benefit of hindsight and we have very few options left to us too. We need to acknowledge this position and the decreasing ability for government to intervene further even if they want to.