Photo of Abdullah Momeni, prominent critic of the régime, courtesy of The Telegraph
"They were probably just ordinary customers," he whispered, as he ushered The Sunday Telegraph back on to the streets to continue the interview elsewhere. "But you never know. We were sat in that café for 45 minutes, which is long enough for the intelligence services to find out where we are."
A paranoia about who might be listening is an occupational hazard for activists like Mr Nesbati, whose campaigns for reform of Iran's theocratic government have led to constant run-ins with the secret police since the late Nineties.
But that sense of paranoia is now greater than ever, as a long-feared crackdown by Mahmoud Ahmadinejad, the country's puritanical leader, finally appears to be coming into force.
In what activists claim is a "cultural revolution" reminiscent of the Islamic Republic's turbulent birth in 1979, the regime has turned on its critics in all walks of life, harassing pro-democracy activists, shutting down dissident publications and dismissing independent-minded government officials and academics. Mahmoud Ahmadinejad silences his critics (more) By Colin Freeman in Teheran
Mark Alexander