Omicron,
first detected on 22 November, the decision to move SA and others to the red list was taken
on the 25th November, before the WHO even listed it as a VoC.
Delta, the UK govt announced India was going on the red list on 19 April, we were one of the first countries in the world to do this, PHE classified it as a VoC on 7 May.
In both cases, I challenge you to find a country that reacted faster.
If you don't include Russia in Europe, Italy is likely a long way top in absolute terms, followed by Ukraine and Poland with us in fourth place, the difference of course is that we accurately record, or even over-record Covid deaths and other countries don't.
All of which is meaningless anyway because we have the second largest population in Europe and the absolute number of deaths is heavily influenced by population size, if you look at relative mortality we're very much middle of the pack.
Which isn't to say that any of this is good, but you're trying to play party politics on the back of 150,000+ deaths, and the story you're telling is not accurate.