I've watched the previous series so knew it would end roughly like that. I can't fathom why anyone would want to take part as it's not actually to get in the SAS.
Without any doubt, the answer is a big NO !
Having been on TV, there faces would have been recorded, and they are now 'known'. Interogating them now would be very easy with what is known about them.
Most of them done the course to prove to themselves what they can take, and would have been informed in the beginning that there would be no chance for them to get in the unit.