Evidence taken from the dash-cam of the vehicle as well as the SatNav, appears to show that Chowdhury left his home address in Luton at around 6.30pm that evening after tapping Windsor Castle into the SatNav.
Almost an hour later, the car arrived in Windsor but, rather than the royal castle, it stopped outside a pub called The Windsor Castle.
Two minutes later, it was driven past the Victoria barracks in Windsor, home of the Coldstream Guards, but did not stop, heading instead to central London.
At around 8.15pm the driver arrived at Constitution Hill in London, not far from the Mall.
He drove around in a loop before the vehicle came to a stop by a police van and he was detained.
Chowdhury appeared at Westminster Magistrates Court on Thursday charged with one count of preparing to commit an act or acts of terrorism.
Wearing a grey prison tracksuit, he spoke softly but clearly to confirm his name, age and address.
Chowdhury stood with his hands clasped in front of him as he was told he would be remanded in custody and that the case would be transferred to the Old Bailey, where he would appear on September 21.
He shook his head as he was led out of the dock following the brief hearing.
This article originally appeared on the Daily Telegraph.
