It doesn't matter whether you are after this particular model or any other +£500 TV or appliance this long winded method will save you some serious cash between now and Wednesday. Sony KDL50W829 is just an example.
£729 Curry's price
-£50 O2 Priority discount on £500 spend
-£10 Amex credit on £50 spend
-£24 fuel save (60p x 40l) if you buy £600 worth of Curry's gift vouchers in Morrison (the total discount would depend on your fuel tank capacity).
-£10 potential if you ask Curry's about extra insurance. They have one at £6.50/month and will give first month free but this will reduce TV price by at least £10. You can cancel insurance at any time.
Total down to £635.
Quidco/TBC saving on top if bundle available for 1h pick up.