Yet it worked well. In Cheshire (not badly hit), daily cases halved between the start of lockdown and end, having doubled in the previous month. In Cumbria it was even more of a drop
Overnight covid paitents in the NW went from a peak above that of April in Mid November (i.e. had caught it in October), dropping to 70% of the peak a month later, same in NE+Yorks.