Rosie51
I know someone who has a second holiday home (brick built house in a village), a static caravan in another area, and a beach hut (not a good description, this one has a full cooker and heating system but no mains sewerage) in a third. None are available for holiday lets so I really do think they impact on the local areas. Unoccupied they contribute zero money to the local economy, although I accept they do not impact school or medical services. I suppose I just think nobody should have a second home until everybody has a first one.
Well, it rather depends on where the second house is. There are many places, take Blackpool, where there are streets if derelict empty houses. DD saw them there about a year ago.
Blackpool is one of the poorest areas in the country, high unemployment, high levels of deprivation. Few locals have the income to buy these houses and renovate them. I think an influx of second home owners who bought the houses because they were cheap and employed local businesses and local epople to renovate them would be welcome like manna from heaven. And as you say Rosie, they may spend money when they are there, but often leave them empty - and when they are not there they place no demands on roads, schools, the NHS, police or any othe local service.
I can see the problems in popular areas where houses are priced out of pockets of local people and where the proportion of second homes in previous thriving communities damages those communities.
But the question of empty houses is complex. many of them are in places like Blackpool where supply of houses exceeds demand. London boroughs have tried offering these houses in the north to homeless people in their boroughs, but if someone has a job, albeit poorly paid, children in school, and family networks, why would they want to go somewhere where they would be unable to get a job, have to disturb their children's education and where they would not have important supportive community and family networks - and, of course, unable to afford the cost of travelling to see them.