Yeah, but, Saints (or Tonda) haven't brought the game in to disrepute. Nobody would have been the wiser of Boro hadn't grassed. So, technically, they're the ones who should be punished.
Case closed, your honour.
I don't really see how a single relegation would be punishment either. If they were relegated to the Championship they'd simply walk the league and probably be back in Europe (if not banned) within a couple of years.
Need to be thrown out of the league all together and work their way back up (fairly...).