There will be blame Mike as there has been fault. I take your point that there was no rule book for this pandemic and that’s mostly correct, but we have now had three waves and not learned from any of them.
We only know what we have been told and the information I have received suggest that Boris has not followed the scientific advice, certainly no when they offered it.
So as far as the information I have obtained, through various outlets, Boris did not act quickly enough on the expert information being offered.