It is also warning that some trainee teachers face difficulty in finding a school placement despite assurances in the agreement that every "probationer" will get one year's training.

BBC: New fears over teachers' pay

Last weekend, Goldman was forced to make an about-face on its original plan to make the private placement available to its U.S. clients, too, because Goldman said intense media spotlight about the deal left it in danger of violating U.S. securities laws.

WSJ: Facebook Raises $1 Billion From Goldman Clients