Free Roam mode Complete all standard missions to unlock the "Free Roam" option.
Skip intermission sequences Press R3 to skip some intermission sequences. Note: Not all sequences can be skipped.
Gas tank kills Shoot a gas tank when an enemy is nearby to easily kill them.
DC Carter moves Knock out hostage: With a gun, press X to get a hostage then press Square. Kick hostage: While unarmed, X to get a hostage then press Square.
Mark Hammond Mother Press L2 L1 L2 L3 and you should hear a woman scream then your character will automatically change.
Double health Press Up(2), Left(2), Right(2), Circle(2), Down at the title screen. The sound of a woman groaning will confirm correct code entry.
Full Recovery When you have been shot, and you badly need health walk up to a wall (any) and stand next to it close he will then lean up against it, it may take a few seconds but wait till he gets off, he will have a full recovery. (submitted by mark)
Infinite Ammo Cheat During the FMV that precedes the main menu, press UP, DOWN, LEFT, RIGHT, TRIANGLE, UP, DOWN, LEFT, RIGHT, SQUARE. Repeating the code disables it.
Hidden vehicles You can find some hidden vehicles in the parks of London, such as a sooty van (Little Suzuki van with grass in the back) and a very fun golf cart parked behind huts and bushes around the parks.
Select Free Roam mode once it is unlocked and make your way onto Oxford Street from the start point. Head west past the marble arch and onto Bayswater Road (use the map supplied with the game for road names). Follow Bayswater Road westward as far as the game will allow you to go, then turn left at the blockade onto the Hyde Park Inner Road. The Hyde Park Inner Road U-bends back around to travel through the center of Hyde Park at this point. At the back of this U-bend is an open gate. Go through it, and parked outside a mansion is a Nissan Skyline GTR and a TVR. In the garage opposite the mansion is a Lotus and a go-cart.
To get the Concept Lexus and a Triad Gang Car (souped-up Honda) in Free Roam mode, in the mission where Carter infiltrates Jolson's warehouse, go to Chinatown (located in Soho). Go down into the underground garage (the same car park where the Triads and Yardies have a gang war). The position of the cars varies on each floor.
Armored car weapon Press Up, Down, Left, Right, Square, Triangle, Circle at the title screen. The sound of a woman groaning will confirm correct code entry. Note: The weapon can only be used during missions.
Hints:
Mark Hammond moves Shoot hostage: With a gun, press X to get a hostage, then press Square. Break hostage's neck: While unarmed, press X to get a hostage, then press Square.
Turn signals In free roam mode, for added realism you can use your indicators (turn signals). Press L1 to indicate right and L2 to indicate left.
Health recovery If you have been getting damaged badly by enemies and are close to dying, walk up next to a wall. Your character will lean up against it in order to recover. With each breath your character takes, part of his bullet holes disappear until he is fully recovered. This may take a minute -- make sure that no enemies are attacking you.
Kelvin Deamer mode Complete the game to unlock free roaming mode. Then, go to the golf cart that you will find in one of the parks. Press Up, Down, Triangle, Down, Triangle, Left, Right, Circle, to be transformed into a character known as Kelvin Deamer.
