There is no easy answer, although I go to homes of friends in their 90s that are warm and toasty, my career experience was that as we age anxiety and ideas of poverty increase. So inspite of adequate income and heating systems many elderly will not be persuaded to keep their homes warm, even putting on the heating for a patient in the community would not help for after you left it would be turned off. Assessment into reasons why a home is bitterly cold is needed.
People eating and drinking on the go
To think that London, or anywhere else for that matter, does not belong to any one demographic