Have a very careful read of the exchange with Terry Doe that Jason posted up.. and look very carefully for the word play.
Someone said they have an email from the HO saying SA's are legal.
Terry said, if they said that the have misinformed you.
He's quite right... because no one from the HO will say they are legal (Legal means, not against the law)
Actually what the HO said was - you don't need to have a certificate - which is also correct. (because they'd said they won't enforce that law)
Do you see the distinction? and the careful word play going on there?