Comment by permo-w

It is good to be sceptical, but Which? is a charity that doesn't take advertising money, and keeps afloat with paid subscriptions. If it got out that they were taking kickbacks, even setting aside the probable illegality, they'd never sell a subscription again.

It's one thing for some shady website with little to no reputation to lie about these things, but Which is an old company whose model is entirely based on trust.