Indian doctor Sabeel Ahmed, charged with terrorism offences in connection with the failed Britain car bombings, on Monday pleaded not guilty before a court in London.
He was remanded in custody till August 13 after a preliminary hearing at the City of Westminister Magistrate's court.
The London Metropolitan Police charged Ahmed, 26, last week with having information that could prevent an act of terrorism.
He was detained in Liverpool on June 30. Three persons have been so far charged in last month's failed car bomb attacks in London and Glasgow.
Iraqi doctor Bilal Abdulla, the passenger of the jeep allegedly driven by Sabeel's brother Kafeel Ahmed, was the first suspect to be charged last week with conspiring to cause explosions in Britain.
Kafeel Ahmed, 27, suffered 90 per cent burns and remains in hospital under armed guard.
Scotland Yard said Sabeel Ahmed, charged under the Terrorism Act, is accused of having information that could have helped police prevent another person committing an act of terrorism or arrest and prosecute them for terrorism offences.
Ahmed was brought to the court wearing a white jumper and trousers, standard outfit for people interrogated at the Paddington Green Police station and then charged. He just gave his name and address.
A source hinted that there was strong indication that Dr Sabeel had information about the bomb plots. But this could not be confirmed, since no evidence is released before being presented to the court during trial.
Sabeel is alleged to have been in possession of SIM card left by his cousin Dr Mohammad Haneef, who was working in the same Halton Hospital in Cheshire before he left for Australia.
Sabeel was arrested from Lime street station area in Liverpool.
Meanwhile, Jordanian Dr Mohammed Asha, 26, who lives in Newcastle-under-Lyme, Staffordshire, is being held at London's high-security Paddington Green police station.
Two unnamed trainee doctors, aged 28 and 25, were released without charge from London's Paddington Green police station. Both were arrested at the Royal Alexandra Hospital, in Paisley, Scotland.