Damien

This is because of the weird way the prices are set. For some reason TFL Travelcards fall under the structure of National Rail whereas single fares and buses fall under TFL. The later have indeed been frozen but the former have gone up in line with the rises across the board from National Rail. The other weird consequence of this is that now TFL season tickets are even worse value, most people will be better off going as Pay as You Go.

Of course he shouldn't have promised it. It's simply not true that people won't pay more. Although Guido misquotes him slightly, the manifesto does specify it applies to TFL because obviously he has no control over the (actual) National Rail trains at all. Still even the full quote makes it seem season tickets would be included and they're not.