It gets a bit confusing as Lexus call their accessories range F-Sport with items such as the F-Sport intake and the F-Sport exhaust, which are not actually fitted to the F-Sport as standard but accessories items available to all models.
I'm not 100% sure the F-Sport exhaust was available in the UK, I believe it is a HKS system with a F-Sport logo engraved into the tip, listening to video from the US it sounds a lovely system but does come at the usual Lexus pricing