I'm surprised that so many are surprised about another lockdown.
When the numbers rise, they need to be bought down. Lockdown over half term stops people from travelling therefore containing the virus to that area.
It's happening everywhere around the world, why would the UK think it would be different there 
I'm on week 10 or 52 of second lockdown with a curfew having previously done 8 or so weeks earlier this year.
It absolutely fucking sux and I'm close to the edge now with it all, homeschooling and working. But there's no other option until there is a vaccine.
There's no 'living with' a virus that does such long term damage to the body even for those who've had a mild case.
The knock on health affect of Covid 19 I believe is going to be felt by lots for many years.