I'm guessing that you're in the UK since every link I see for Webbox Roll point to that side of the pond - you might want to take a look at All About Dog Food which is much like PetFodAdvisor here in the US. We do have several Brits who log in here so I'm sure you'll get some good local suggestions though it may take a day or two.
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“Properly trained, a man can be dog’s best friend.”
Corey Ford