If you watch the trailer for the next episode when Sian Lloyd appears to Raef and Michael, Raef introduces himself and then says "this is Michael" and she says straight away "Hello Mike". Also as she walks in although Raef is standing in front of Michael her eyes go straight to Michael and she smiles. We all know Michael got on this series through his "connections" and his acting background is also documented. If he already does know her and is using her in a task and pretending he doesn't know her then is this cheating?

I dont think its really cheating, they would have all used some kind of "connection" to get them in a position to be on the show, in Michaels case his connections are documented and they include public figures. Unless Sian Lloyd or any of his other media connections have the ear of Sugar then it doesnt give him an unfair advantage over the other contestants, although it could have given him an advantage in the application process... but i dont think he can be blamed for that.

Although I dont know I would imagine the production team do their best to ensure everything is kosher (its almost getting old) as the series is so popular and there would be a thousand other applicants who could bring the same level of stupidity and arrogance to the show.