I toatally agree with highifeboy, i also went to the GSM interview a couple of years ago and had exactly the same thing happen to me. I have flown for a few years with my present company and thought i would go and see whar GSM had to offer. Every single person who had flown before got rejected at the first stage which i thought was a bit strange however i think it was a lucky escape as one of my best friends got a position with them(she had never flown before) and some of the stories she has told me and the way they were treated is disgusting. She left after a few months as GSM was not for her and is now flying for another airline which she loves.
I think this is the reason why they dont like experienced crew as i dont think we would tolerate being treated like that. If the CAA found out some of the things that goes on within that company then they would be seriously in trouble.
My advice to anyone would be to stay clear of this company and aim for better things.
Its such ashame because they really do have some lovely crew working with them.