Erol Incedal had the address of one of the Blairs’ properties on him when he was stopped by police, a jury was told.
Prosecutor Richard Whittam QC, opening the Old Bailey trial, which will mainly be heard in secret, said Incedal may also have been planning an “indiscriminate attack” similar to the Mumbai massacre.
Incedal, formerly known in the case as AB, is accused of preparing acts of terrorism and possessing a document entitled Bomb Making on a memory card. The 26-year-old from London denies the charges.
Mr Whittam told jurors Incedal was stopped on September 30, 2013, for a road traffic offence.
Inside the black Mercedes he was travelling in police found a number of items including a piece of paper with the address of the Blair property on it. It was found inside Incedal’s glasses case, the court heard.
Mr Whittam said: “Count 1 does not suggest that Erol Incedal had settled on a specific target or a particular methodology but in the context of the case as a whole and the evidence that I am going to come to, you may think that this address does have some significance.”
Outlining the prosecution case, Mr Whittam said: “You will hear that he was actively engaged with another or others who were abroad.
“The prosecution case is that such engagement was for an act or acts of terrorism either against a limited number of individuals, an individual of significance or a more wide-ranging and indiscriminate attack such as the one in Mumbai in 2008.”
Other items seized from the car included an Acer computer and a Sim card and USB dongle.
During the search, a listening device was put in the car, Mr Whittam said.