Protests engulfing Iran have reached a point of “no return” as demonstrators demand wide reforms beyond the end of mandatory hijab rules, said British-Iranian charity worker Nazanin Zaghari-Ratcliffe, who spent six years detained in Tehran. She said the government’s crackdown on the popular revolt and shutdown of the internet showed it was scared of losing control. “The anger has been building up for many, many years,” said Zaghari-Ratcliffe as demonstrations raged for a sixth week, triggered by the death in police custody of 22-year-old Mahsa Amini after she was accused of wearing her hijab ‘…