A friend of mine was looking for a house to rent after relocating to Heathrow. He found a really nice detached place between Maidenhead and Windsor. The garden backed onto the M4 but the bottom of the garden included a wooded area so you would never know the M4 was there.
Anyway, the rent was unbelievably cheap and when he asked why was told that it was owned by the Highways Agency who had apparently bought lots of similar properties all along the motorway so they could widen the M4. The deal was as soon as it was agreed you had 3 months notice to relocate. This was around 2008 and he is still there.