Fell for the "free" advert routine.
Not only do you automatically get charged after the 7 days, no warning, no invoice, no confirmation- shows up on your banking statement. Guess the theory is the larger organisations will not notice. You can complain and be told clearly on the site... however I don't remember charges on the site.
Next month goes along and the same happens again- only this time it was cancelled so how do they explain this?
Looked up various reviews, this appears to be a practice they have adopted that works for them.