So a permit to ply from Temple Meads is only a little over half the cost of one for Bristol Parkway or Bath Spa? Strange. One would have assumed that the bigger the station, the greater the price that could be charged for the permit. Presumably Bath's tourist trade boosts its numbers (but it has a much smaller forecourt), but what about Parkway?
I wonder if we should look the "other way" - to the typical taxi journeys - for the pattern in station fees.
Speculation - the most common taxi journey from Temple Meads is to closer locations within the city centre, with the average fare per pickup being "X". But from Parkway and also from Bath, there isn't this dominance of very local trips and an average pick up fare will be "3X". Therefore a Parkway or Bath permit has a far greater earning potential than a Temple Meads one.
I tend to disagree slightly. There are many thousands of homes that are closer to Bristol Parway than to Temple Meads yet still within a tenner fare, including Stoke Gifford, Bradley Stoke, Patchway, Winterbourne, Bromley Heath, possible even Keith Emersons Green. Then there is Thornbury and its suburbs. I wonder if the taxi permits are more a traffic control measure than a slice of the profits.