I don’t think it has anything to do with politics. It’s literally to stop the NHS from being overwhelmed and so that not too many people are dying.
At present, the number of people in ICU (has actually gone down this week to last) and number of deaths (weekly average down at 112) means that a lockdown is likely not necessary. But having a precautionary circuit-breaker since the cases have sky-rocketed to an all-time high, wouldn’t be a bad idea.
If ICU and deaths numbers start to increase at a rapid rate, we should tighten restrictions.
The govt’s popularity is at an all-time low so they won’t be doing this for popularity reasons.