The Time Lord Academy/Dashes

From Tardis Wiki, the free Doctor Who reference

Which is the proper format for use of a dash as separator on this wiki? I had been going with the spaced en dash, as I'd seen the most of that, but I've recently seen people attempting to approximate the em dash with a double en dash, and removing the spaces from around the en dash when used as a separator. I tried to find a UK style manual or help topic on it, and all I found was that most, but not all, publishers in the UK use the spaced en dash. Examples:

  • Spaced en dash: end - but not
  • Unspaced en dash end-but not
  • Approximated em dash end--but not