Below is how using Currys Price Promise... NO HASSLE AT ALL!
This TV has already been reduced from £699 to £649 in currys...
BUT in Richer Sounds it is only £519.95 @ http://www.richersounds.com/product/tv---all/lg/50pk350/lg-50pk350
and is IN STOCK in a lot of stores (I used Holborn Branch, London).
So basically you go to currys (can reserve online) and then price match it and get the difference (£129) + 10% of the difference (£12.9) discounted.
Ps. I got mine from Currys in Leyton, London.