Well, I suppose it is a lesson to us all that buying a piece of land is no guarantee as to planning permission.
Which is a shame for us lot as I am pretty sure most people on here have dreamed of building their own house to their own design and specification. But as was said, if you let one guy do it then you will end up with everyone doing it. And whereas many people will build beautiful and individual houses, you will end up with someone building something ugly just to save a few quid (or because they have no taste!). I can think of many other reasons why it would be a bad thing, towns sprawling into the countryside, zoning issues.
I saw a programme about houses from hell (not at all sensationalist!). This developer company had built a £6M (I think) apartment development on a chunk of land they bought. A load of existing residents were somewhat miffed at the fact that you could plainly see into their houses from the windows of the new flats. So, they scoured every bit of paper to do with the development and found it had been built about 6 feet too close to the existing houses. The council made them pull it down. The developer appealed but it was rejected. So, they were made to pull it down and rebuild it 6 feet further away!
It makes me wonder, would it have been a shrewder decision for the developers to offer the residents who had a case against it, a few thousand pounds and a set of curtains in the event that all complaints were dropped? Perhaps the council would have sooner allowed the building to stay if there were no complaints?