According to NeoGAF user Nib95, the London level of Gran Turismo 5 Prologue uses assets taken from The Getaway 3. From a conversation with one of the lead designers on The Getaway 3, Nib95 says that the Sony London studio title actually looks better than the London GT 5 track, and is obviously on a far greater scale than just the area seen on GT and that apparently this is due to The Getaway 3 only needing to run at 30fps at 720p. How much of this is true is anyone’s guess.