How do we actually stay impartial on press trips?

Impartiality is the backbone of the fourth estate, but how do we deal with it when we're getting freebies?

I have done a fair amount of hotel reviewing in my time. I’ve written reviews for magazines like Red and Good Housekeeping, I’ve written in-depth reviews of accommodation for my books, and I’m the Telegraph’s Oxford expert, which involves writing standard reviews like this, as well as occasional hotel features like this one about a public toilet convers…