5) airbnb.co.uk

The wonderful Zoopla lets you check the market value of your neighbour’s house, and if a property is for sale, you can snoop around it for fantastic interiors inspiration. This database of rooms to let for the night is another solution. It is used by holidaymakers to find a place to stay for a fraction of hotel prices. But design magpies can use it to find ideas, or simply to keep up with the Joneses.