As a general rule of thumb (UK, specifically) asking for implicit permission will either get a standard no or no response at all. However, if the information i

As a general rule of thumb (UK, specifically) asking for implicit permission will either get a standard no or no response at all. However, if the information is reasonably accurate and links back to the merchant's site it is very unlikely they will complain, especially if the links are 'follow' and not affiliated (not that it would make much difference anyway).