I'm literally playing through the story of this at the moment. Dug out the PS2 just for this and some GT4.

The story is great, the gameplay is clunky, but of it's era. The driving can be rewarding, but using a worn PS2 controller does make it a troubling experience. The map is basically a 1:1 of a portion of London, you can literally overlay it onto Google Maps, it was super ambitious of them and packing it with licensed cars really makes the game feel grounded.

This is one of my absolute favourite open world games on PS2.