LoftyLottie, befriending elderly, often lonely and housebound, people is extremely rewarding and fascinating, I have learnt so much from the old folk I have been fortunate enough to meet through my volunteering efforts. I speak as an oldie myself. However if you do befriend through any organisation you will need a full CRB check, not a problem to most and mine was paid for by the local council, but some feel it is an imposition especially if you have to fund yourself. Good luck with your search.
JJ