The director of controversial advocacy group Cage has been convicted of an offence under the Terrorism Act for refusing to hand over the pin number for his mobile phone at Heathrow Airport.

Muhammad Rabbani, 36, was stopped under Schedule 7 on November 20 last year after returning home from a wedding in Doha.

He refused to give his pin or the password to his laptop, saying he had been stopped many times under the schedule before and had never been required to give these details.

Rabbani said he had highly confidential information on his device and that handing it to police would be a breach of his "personal and professional" privacy.

But on Monday he was convicted at Westminster Magistrates' Court of one count of wilfully obstructing a stop-and-search under Section 7 of the Terrorism Act.

Senior District Judge Emma Arbuthnot said: "I find he took a calculated risk and, as on certain earlier occasions, the police wouldn't take any further action.

"He took a calculated risk. At the time of the stop he was warned over and over he would be committing an offence if he didn't provide the information."