Thanks Kingy,
That does look like it would do the job, its just I am under strict instruction from HWMBO, I am only allowed to buy a 50" plasma if it comes in at under the height of my current telly which is a 44" sony rear projector.
The problem is I have my telly in front of a bay window so it blocks out a bit of light

I think anything over 400mm would put me a bit too close to the height of the Sony and with the extra width of the plasma it's going to look massive anyway.
I quite like the look of the Ateca range but I have found different dimensions quoted on various retailers websites so I don't know which is right.