Paul hence why i quoted 1080i....INTERLACED not 1080p PROGRESSIVE
Indeed a 1900 x 1080 screen is needed BUT its highly unlikely HD in the UK will EVER go 1080P.......
Paddy if you hook a PC or XBOX up then its needed...if you play DVD's it will also upscale so std films will look better too.

(if connected to the HDMi port!