Despite rumors to the contrary, Swindon is still geographically and ceremonially in Wiltshire.
Organisationally it's not ... please read my previous email as "Stations within the Wiltshire administration area". You can tell it they are regarded as separate by the name of bodies such as the "Swindon and Wiltshire Local Enterprise Partnership" and the "Swindon and Wiltshire history centre".
GWR▸ journey planner only offers via Swindon
In some cases ... in others, it's the opposite. If I were headed for Bristol Parkway in the next half hour, I would be advised:
Where in practise I would advise catching that same 12:28, change just once at Swindon, and arrive at Parkway some 40 minutes earlier that the journey planner suggested.
Should I ask for a journey beyond Bristol Parkway, GWR's site is quite happy to route me via Swindon ...