If you have quidco they give 5% off and also you can use this code EXPANSYS450 for £10 off £450 purchase so I added a fm transmitter at 82p and the code workedhttp://www.quidco.com/expansys-uk/?ac
then after quidco tracks at £22 the phone should cost £418.81
Also topcashback might work
As the world's first dual core smartphone, the LG Optimus 2X sets a new benchmark in performance. The NVIDIA 1GHz Tegra2 dual core processor makes everything, from navigating the Android operating system to browsing the web and application multitasking, work with impressive speed and virtually no lag. Everything underneath your fingers is fast and smooth, no matter how hard you push the Optimus 2X.
Utilising the two 1GHz processor cores and its 8 megapixel camera the LG Optimus 2X can record and playback video in full 1080p HD, and the HDMI socket lets you show off your photos and videos on your HD TV. The Optimus 2X has a 4 inch touchscreen, with 800 x 480 resolution and the NOVA technology from LG that offers excellent contrast with deep blacks and strong whites.