TFA has now silently deleted my comment, corrected that one statement, but not corrected any other derived results. For example, the following statement is still wrong by a factor of 1000:
> If every person living in the UK had the same amount of space to live in we would have just under 3.9m2 each.
No, it isn't. Wolfram Alpha reports that it is 249,430 km^2. To convert from km^2 to m^2, you multiply by 1000000, not 1000.
This throws all your calculations off by a factor of 1000.
Schoolboy error.