How much is an iPhone 5 worth now UK

How much is an iPhone 5 worth now (UK) thanks?

I think quite a bit if in good shape as the trade in is higher then this below
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Apple also recently boosted the trade-in values for the iPhone 4 and the iPhone 4S. Apple Stores now offer up to $99 toward a new device for an iPhone 4 and up to $199 for an iPhone 4S.

It costs around £400 on Amazon for a 16gb and £549 on Apple for a 16gb.

  • Is it worth getting an iPhone 4/4s now? The contract for my phone runs out on the 5th of August and I've been looking at getting a a iPhone 4/4s. However the iPhone 5 is coming out next month and, although it'll be too expensive for me, I'm guessing it will push the prices down of the 4/4s. Is it worth waiting for the release or will the price drop take too long/not be that much anyway?
  • Is it worth buying the iPhone 4s now? With the new iPhone announcement so close would it be worth buying the 4s now? Will the new iPhone have an unlocked version? I have T-Mobile, or will T-Mobile come out with a iPhone of their own?
  • Is it worth buying a iPhone 4s right now? I'm 14 and i have $250 right now but i'm going to sell my iPod touch 4 gen and ill have about $450 or more and should i get a iPhone 4s or a iPod touch 5 gen? Or should i wait 5 months and get a iPhone 5 64GB?
  • Is iPhone 4s worth it right now? Right now I have a Galaxy S3 in blue. And I'm just not feeling it and I want an iPhone again like I used to have one. But the thing is, I wanna trade my S3 for an iPhone but the iPhone 5 is so expensive so I can't trade for that so my question is… Is it worth trading my Galaxy S3 for an iPhone 4s? On ebay I see iPhone 4s going for about 400-450 which is about the price of a Galaxy S3. Is it worth it? And how big a performance difference is it between the two?