We are buying a flat which will eventually be rented out, in central London, and we know that bits and pieces will need doing to it, probably at a time when it doesn't have an agent/tenant. It's all the odd things like letting people in to measure up or start a job, or if there's a leak into another flat etc.
We don't live in London and it's a pain to go down for odd appointments like that (not such a problem for a sold weekend of moving furniture, it's those 5 minute things that would be really impractical).
Is there such a thing as a porter type service for an area for people who don't have a porter in their block? I looked at "keyholder services" but they are for businesses and respond to alarms etc.