It depends on the amount of detail. Mine cover my shoulder blades, and the outline itself was $200. They'll probably be an additional $150-$200 to shade in. <img src="http://a67.ac-images.myspacecdn.com/images01/12/l_0376867344c7108a615868bee26dc03a.jpg"> If you're covering your ENTIRE back it depends on the artist. Some charge for the hour on bigger pieces, the guy I go to charges $100 hourly. Or they will just charge you for the whole piece to cut you a bit of a deal. I would say no less than $700 for a lot of shading/detail/or colour.
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Depending on the tattooist and depending on how long it will take, tattooist can vary from £30 to £80 pounds an hour, I recommend spending more to get a better quality tattoo, do some research and look at the tattooists books, look at their work and see if it's a good enough standard, don't risk it
In the UK it would cost anything from £700 - £3000+ depending on the artist, the time it took and the detail on it