Thank you Jiko for the help, advice and sample pics.
As a matter of interest, I was just out driving when I passed a 'Bestbuys' store near our local shopping center when I saw a 'Closing down sign' with everything 25% discount. Popped inside and they have one 5D MK II brand new for £1200.
I have never been so tempted in all my life as it was about £300 cheaper than Amazon.
But something told me to wait until new year and I didn't buy it. They also had a lot of Canon lenses but not the one I want.
If you have a BestBuys near you it might be worth a visit to see what bargains they have.
Anyway back to the Lens I will probably go for the IS version and use it on my 550D until it's time to buy a FF.
Thanks for reply.