This seems like a good deal to me.
If you buy the 40GB PS3 from Amazon with GT5 for £289.99 you get a free HDMI cable. You can also use a discount code (on the PS3 console page) to get an additional game (such as Assains Creed or Fifa Street, Burnout etc...) for £15.
That's £305 for a PS3, GT5, Assains Creed and a HDMI cable. Seems like a hot deal to me.
I also wanted F12007, so threw that in for a further £19.99