Have just been looking and using the newly posted code FIVEOFFTV & the PR25 code you can get this tv for £696.05, using your egg card will gain you 3% instant cash back & quidco gives 3% as well potentially making the tv £653.99. I ordered this tv at christmas and have been very happy with the picture on sky hd,360 & PS3. (although I'm currently awaiting a new one due to a couple of stuck pixels). . I suppose this method can be used for a discount on any tv over £499. For egg and quidco discount together just use the quidco link and the egg discount comes off anyway.
EDIT : PR25 HAS EXPIRED USE QC20 CODE TO GET £20 OFF INSTEAD OF 25
review of tv: http://www.hdtvtest.co.uk/Samsung-LE40M86BD/