This is the cheapest price around for this 42" LED TV at the moment and Tesco are offering a free £50 Tesco voucher with it.
3.03% cashback available at Topcashback = £15.12 saving
1008 clubcard points = £10 saving
Total cost assuming you receive voucher, cashback and clubcard points is £428.88 (inc. £5 delivery).
Summary: A very high spec TV without 3D, but that's not essential for most people. This is easily the best spec 42" LED TV you can get for the price.
***NOTE*** £50 voucher deal is mentioned on this page: http://direct.tesco.com/q/buylist/id.5658.aspx