Well, it's a switching supply, which means it's more efficient than a simpler wall adapter (as if one existed, capable of outputting 20 amps!!!).
I can't remember the conversion rate, but isn't 35 pounds something like 70 USD? If that's the case, I think you can do better.
The specs would be nice, like, what's the output tolerance? Ripple voltage? Not that it matters much. How do you hook into those ports anyways?
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