My first thought was "Age Concern" when I read this story. If you follow this link http://www.ageconcern.org.uk/AgeConcern/local.asp And type in London, you get the contact details for all of the London based branches of Age Concern (there are 32 - I don't know where you are based in London). Maybe you could print a list of the nearest ones to you, and next time you visit a vulnerable old person, leave the freephone number with them. Age Concern will know exactly what resources, charitable and otherwise, are available to these people. Keep up the good work, it could be us one day.