I was rather struck by this article:
saying that if Britain had the same child mortality rates as Sweden there'd be 2000 fewer deaths per year in children under 14. A quick check finds:
(why didn't I know about that site before?) which says that in Sweden there were, in 2011, 2.80 deaths amongst under 5s for every 1000 live births (down from 19.40 in 1960) and similarly in the UK there were 5.1 (down from 26.5) and that the UK live birth rate is 12.90 / 1000 of the population. Assuming a population in 2011 of 62e6 peeps that's 799800 per year for an under-five death rate of 4079 whereas with Sweden's rate it would be 2239 so an extra 1840 per year. Adding in the presumably lesser number of deaths from age 5 to 14, 2000 extra deaths per year seems entirely plausible.
The Guardian article and this one from the BBC:
point to the differences between the rates for the rich (or relatively so) and poor in this country mentioning lifestyle issues. What they don't mention is standards of housing which I can't help think is at least part of the story though it's probably difficult to say how much.