In fact, the ASA have today found that the advert is misleading (in part): http://www.asa.org.uk/ASA-action/Adjudications/2011/9/Trainline,-d-,com-Ltd/SHP_ADJ_158295.aspx. As you said earlier, the small print on the TV advert itself just says 'Advance fares and selected routes only'; the extra...