Noticed something really strange. Normally Melksham to Bridgend can be bought as one ticket. The National Rail journey planner is refusing to do this for 27 and 28 December and is trying to sell separate tickets Melksham to Swindon and Swindon to Bridgend. The culprit seems to be Christmas engineering work, where the South Wales trains are being diverted via Box (non-stop Swindon to Patchway). So it's seeing it as a double-back between Chippenham and Swindon, which would be fair enough if GWR were stopping the diverted South Wales trains at Chippenham, but they're not! I doubt any GWR guard would challenge this in reality (it's the sort of level of unreasonableness that only a computer could come up with), but this is quite annoying.