I am looking again at the rest of Europe, starting with Portugal. Exactly the same picture as England. I estimate net 1,400 deaths postponed in Spring but it would have been over in 19 weeks with 3,200 deaths with no interventions.
In Autumn/Winter, with better conditions, the virsu would have accounted for 6,000 deaths, again within 20 weeks with no intervention. However, what appears since Xmas is not the same. The process implies a 43 week duration. This is not naturally self-limiting.
France did not have quite the same success with interventions as Portugal in Spring, postponing about 23% of deaths. With no intervention the epidemic would have lasted 15 weeks, accounting for 39,000 deaths instead of 30,000.