Don't expect to make £1000 a month editing the Gransnet site, though. I'd say that would only happen after years of hard slog getting adverts in a highly competitive market from a cold start, and the advertisers have the option of a free listing on the sites - why pay when they can get it for nothing?.
You would get £100 a month from Gransnet for the first year, to cover your expenses getting going, which is something. That is unless the money earmarked for that has run out now.
Contact them, Phoenix. You would be very good at it - organised, outgoing, able to write copy. There is nowhere for funny accounts of your day, though, be warned.