How much is iPhone 5 if iPhone 4 is traded?

I have an iPhone 4 (not 4S) and I want an iPhone 5 but I don't know how much difference you have to pay to get it, if i trade in my iPhone 4 too. (UK pound £££)

The iPhone 5 is thinner longer and lighter. You can stretch your photos and it also has a new YouTube app and siri. The iPhone 4S is the same as iPhone 4 but has Siri. I would recommend the iPhone 5.

Very doubtful they'll trade. They would do a upgrade most likely. But no places really trade phones to get a new one. Only upgrades. Look online where you got your phone or the company you got your phone crom. Use their websuite an see.