> Or we could just build more
  > homes, rather than cramming
  > everyone into a smaller space.

With a spare bedroom tax, the average space per-person doesn't change, but the median rises and the cost drops dramatically.

  > This message written from my
  > study, which you'd tax me to
  > be in because of course any
  > luxury must be eliminated.

A spare bedroom tax only applies to houses with two or more spare bedrooms. It also replaces propert tax, and so in your case you'd be better off financially.