According to a British Army source, the newspaper said in an article published on Sunday that " More than 300 have passed through a base just inside the Iraq border, while a command course is run in Saudi Arabia."
The article added that "Groups of 50 rebels at a time are being trained by two private security firms employing former Special Forces personnel."
"Our role is purely instructional teaching tactics, techniques and procedures," the newspaper quoted a former SAS member as saying.
"If we can teach them how to take cover, to shoot and avoid being spotted by snipers it will hopefully help," he added.
also see: http://www.firstpost.com/topic/place/syria-british-special-forces-are-training-terrorists-in-syria-video-CihiBzV_H4U-15-1.html. I have to admit that I haven't been able to find any such article on the website of the Sunday Express. Perhaps I have overlooked it.
on July 24, 2012 Press TV covered this topic as well, claiming that Daily Mail also wrote about English troops training Syrian Militias - http://www.presstv.ir/detail/2012/07/24/252536/british-army-trains-syria-militants/