One issue that has always bothered me about TVMs▸ is this: they sell a range of different ticket types for the same journey but do not detail the restrictions that apply to them. Unless you've done your research beforehand or make the journey regularly, it's not always possible to figure out which ticket you should be buying.
That isn't necessarily true nationally. The Virgin TVMs I 've used at Euston and Rugby display the restrictions no problem if you select a
LM▸ fare for instance...
SWT▸ 's machines have a box marked 'see restrictions' when choosing a fare from a list, but usually there isn't any data loaded if you touch it. ISTM that teh manufacturers have provided the facility, the
TOCs▸ just aren't bothered.
Paul