I just want to add, following all the negative comments that were posted here, being a self-critical person that I am, I did a lot of soul searching and self-analysing if I was entirely to blame for what happened. And I realised, with the help of lovely mumsnetters, that I was not.
I did what many other average men and women on Clapham omnibus would have done in my place. It is not reasonably expected that average person would make a search on every company they deal with, read any contract they would sign, or reasonably expect they would be fleeced if not told otherwise. And contrary to what some posters said, I was not thinking of getting rich by making my children work, it was rather like taking an opportunity when it presented itself (on Facebook feed).
Now I know that Aggressive commercial practices are clearly defined in the law, so next time some sales people will crowd on me in a confined space in a room with the door locked, telling me I need to decide there and then, I will know that they are impairing my freedom of choice and thus committing a criminal offence. Or if they ask me to pay after inviting me to a "free" event, as clearly stated in their previously sent email, I will know that it constitutes a misleading action, which is against the law. And if they fail to state that they are not who they have been claiming to be, I will know it to be a misleading omission. Then I will run a mile.
But last Monday I went to the studio with my two small children as an average mum. I believed them when they said they were a respected agency who had Gap, Ralph Lauren and other famous brands amongst their clients. I believed them when they said they would pay £1500-2000 per job. I believed them when they said they only accept 20 out of 300 applicants, and my children were among the lucky few. Well, I shouldn't have, but I did, proud for my children to do so well.
And many other mums and dad and grandparents did, and will, in future. Because we believe in the best, we trust others as we would ourselves and find it unthinkable that someone will prey on us and our children.