I bought a book co-written by Michael Fish and some other weather researchers and it seem that winters past were indeed far more severe than we will know. It includes a few old photos from 1895 showing the great ice floes in the Thames, it looked like the Arctic. There were also records, and enough from enough different sources I presume to be believed, that spoke of the Thames freezing solid for many weeks on end without melting, thick ice they used to have fairs on. We simply do not see that level of freezing over a large area of any river, letalone a coastline, at present. The reasons I know not but I think that regardless of having no central heating, winters could be terrible beyond our comprehension.