For information to assist planning of journeys using a bus pass the website linked below will be of help. Please note:
When requesting bus times, be sure to untick all boxes except ‘bus’ under ‘Mode’ or ‘Mode of Transport’.
For longer journeys e.g. say Manchester to Truro the journey has to be planned region by region, the system wouldn’t handle this in one bite.
Google also offer a very useful method of planning a journey by bus which includes a useful map. (probably best for journeys within your region.)