How to buy brand new iPhone 5 cheaply in UK?

Iphone 5 costs 529 pounds in apple store but I have heard that the british can bought iPhone 5 brand new with only 20-50 pounds! But I can't understand how can it possible. Please explain me if anyone know it.

The iphone 5 is 529 pounds FULL PRICE… But, in exchange for a 2-3 year contract, most likely 3 years since this is England, they will drop the price all the way down to 50 pounds… This is called NEW ACTIVATION / UPGRADE PRICE

now, if you break contract (leave the wireless carrier) within those 3 years, or fail to pay the bill on time and get disconnected, you will be charged an Early Termination fee of 325 pounds PLUS final bill charges (a total of 400+pounds)… This is to recover some cost of the phone they gave you at discounted price.

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