The 50PS3000 from Dixons is actually £719.99, but if you use the discount code BIG5 you can get it for £683.99, been looking for this tv for a while, cheapest price yet.
(The discount code works on all orders over £349)
Here's the info from Dixons website:
Enjoy high quality sound and vision on the LG 50PS3000 50" 1080p Plasma TV. With a range of networking options and extensive picture technologies, this excellent large screen plasma can become the hub for your home entertainment viewing.
Along with HD Ready 1080p, a Dynamic Contrast Ratio of 2000 000:1 and LGs Dual XD Engine, the 50PS3000 can boast a host of picture enhancing features. These include Intelligent Sensor 11 automatically adjusts the brightness, sharpness, colour and contrast of the picture to suit the environment. Additionally, 600Hz sub-field driving technology works to prevent motion blur, making it ideal for fast action sports and movies.
The LG 50PS3000 50" 1080p Plasma TV also provides three AV viewing modes that include movies, games and Sport, each one delivering outstanding image clarity and colour to suit. Two invisible speakers produce a high quality sound for audio technologies, such as Clear Voice 11, that automatically increases the volume of dialogue in noisy background scenes and SRS TruSurround XT that creates a cinema style sound experience in your living room.
Connectivity options include 3x HDMI inputs to hook up your games console, blu-ray player or home cinema system for High definition multimedia experience, 2 x Scart, Component and PC input. You can also link you digital camera via the USB to enjoy large screen viewing of your digital photos.
The LG 50PS3000 50" 1080p Plasma TV also features a built-in digital TV tuner.
* 2,000,000:1 dynamic contrast
* Built-in digital TV tuner
* 3x HDMI, 2x SCART, 1x Component, 1xPC
* Dual XD Engine
* USB 2.0 Input
* Wall Mountable
* 2 No of Scarts
* Line input