Ticket zone data exists where people who thought it was worth having have imported it and no-one has subsequently removed it. An example is Mansfield's "pay scale area" https://www.openstreetmap.org/way/38387740/history which dates from a partial UK import of NaPTAN data about 8 years ago. However, in the case of data that was imported from an external source and hasn't been kept up to date you're definitely better off using the external source directly rather than trying to second-guess whether OSM is correct or not. For example, I deleted the adjacent pay scale area to Mansfield because I knew it was wrong (it matched neither the current pay scale area nor plusbus zone, both of which had changed since the data had been imported).
So to summarise, you might find the data that you're looking for in OSM, but if you do you'll need to make sure it's regularly updated, and even then you're probably going directly to the data source.