There are tens of thousands of houses, warehouses, factories, garages, etc all over the country simply unused and vacant, whilst at the same time there are tens of thousands of homeless or people of no fixed address.
It's simply madness that in a developed country such as Britain we have houses simply sitting there not fulfilling their purpose whilst we have thousands living on the streets. Whilst I believe it is wrong to say move into a house whilst the owners are simply away on holiday, I have no problem what so ever with people occupying buildings that are simply not being used and falling into disrepair.
There is an old corner shop near to me that has been vacant for the past 2 years, the windows are smashed and boarded up, the property is not for sale or rent, tiles are beginning to fall off the roof causing water to leak in, it's simply been abandoned. I'd have no problem what so ever with people moving in, making the building watertight and living there.