There's an easement allowing via Taunton to use SWR via Honiton anyway...
Easement 300227 does say:
300227 (Fare route) Journeys routed Taunton may travel via Yeovil Junction. This easement applies in both directions.
The data for that easement is a bit different in that it only lets retailers make use of the easement on weekends, and only for itineraries which involve GWR. 701383 is Tuesday–Thursday. You can use SWR via Honiton with a "via Taunton" Exeter–Gatwick ticket, but the new easement is an attempt to let you use the diverted GWR trains.
When I look for "Gatwick to Exeter via Slough" now, gwr.com doesn't find any tickets for the diverted trains, only for itineraries which involve a bus from Taunton.
On another topic, some changes were published in the routeing guide yesterday.
Changes from 23 Jul 2025 (581) to 30 Jul 2025 (582).
Easement changes:
Removed:
701351 (Routeing Point) During engineering works from Sunday 17th May to Sunday 27th July 2025 inclusive, tickets from Westcombe Park travelling to Lewisham, Blackheath or Kidbrooke do not have to travel via Charlton. This routeing point easement applies in both directions.
701352 (Map) During engineering works from Sunday 17th May to Sunday 27th July 2025 inclusive, tickets starting between Lewisham and Kidbrooke and ending between Westcombe Park to Abbey Wood will be valid for travel via London Bridge. This map easement applies in both directions.
701353 (Fare route) During engineering works from Sunday 17th May to Sunday 27th July 2025 inclusive, tickets priced on (00700) NOT VIA LONDON from Westcombe Park travelling to Lewisham, Blackheath or Kidbrooke may travel via London Bridge. This fare route easement applies in both directions.
701354 (Fare route) During engineering works from Sunday 17th May to Sunday 27th July 2025 inclusive, passengers from Westcombe Park, Charlton, Woolwich Dockyard, Woolwich Arsenal, Abbey Wood and Belvedere who would otherwise travel via Lewisham may travel via London Bridge. This fare route easement applies in both directions.
701382 (Map) During engineering work between Shrewsbury and Crewe on the weekends of 19-20 and 26-27 July 2025, passengers between Cardiff Central and Manchester Piccadilly may travel via Chester. This easement applies in both directions.
These were temporary easement for which the dates have passed.
Added:
701388 (Local) Passengers travelling from Ilkley, Ben Rhydding, Burley in Wharfedale, Menston and Guiseley to Leeds and beyond may travel via Shipley. This local easement will overcome the shortest distance rule and apply in both directions
It can sometimes be quicker for someone going from an Ilkley branch station to change in Shipley rather than wait for a direct train to Leeds. This easement permits it.
701389 (Fare route) During engineering works on the weekends of 13-14 and 20-21 September 2025, passengers travelling to Edinburgh and beyond with tickets priced on (00421) AP BERWICK whose normal route is via Newcastle and Berwick upon Tweed, may travel via Carlisle. This fare route easement applies in both directions.
This relates to the same line closure as 701366. This overrides the route restrictions on these advance tickets, and means that you can now buy a LNER advance ticket from (for instance) Ayr to Peterborough.
701390 (Fare route) During engineering works between Bristol and Bath from 27 to 30 October 2025, passengers on Great Western services travelling between Chippenham/Melksham and the Bristol area with tickets routed (00831) VIA BATH SPA may travel via Swindon. This fare route easement applies in both directions.
This is being planned well ahead, but from what I can see the line between Bristol and Bath is closed with London trains diverted via Bristol Parkway.
The intention may be to let (say) a Chippenham–Yate ticket be used via Swindon. My understanding is that fare route easements only allow routes which an "any permitted" ticket would permit without the easement. The data doesn't look right, but I don't know of any tickets it would affect even if it was.
Station link changes:
Greenford (GFD) to South Ruislip (SRU) now has a distance of 3.00.
This creates a link between Greenford (that is, the bay platform) and South Ruislip in the table retailers use as alternative to calculating shortest distances.
It doesn't affect the routes they offer between (say) Princes Risborough and London Paddington or Slough as a link was added between West Ealing and West Ruislip in 2021, and a shorter distance can be calculated using that.
Neither route appears in the NRT mileage tables, and neither is used by passenger trains at the moment.
The following post was made on 4th August 2025.
Some changes were published in the routeing guide on Fridy.
Changes from 30 Jul 2025 (582) to 01 Aug 2025 (583).
Easement changes:
Removed:
701376 (Map) During engineering works from 2nd to 28th August, CrossCountry passengers from Stoke on Trent to Birmingham New Street may travel on East Midlands services to Derby and then by the replacement bus service. This map easement applies in both directions.
This removes an easement which was due to apply for most of this month.
The text allowed Stoke-Birmingham tickets to be used via Derby, but incorrectly states that one leg requires buses. The data was somewhat different. It's gone now, anyway.
In addition, the data has been changed for a few other easements.
The data for easement 701383 now says that it allows "via Taunton" tickets used on GWR to go via Castle Cary as well as via Honiton. gwr.com can plan journeys for the affected dates for (say) Exeter St Thomas-London, but it doesn't find tickets if this involves diverted trains. The text remains:
701383 (Fare route) During engineering works between 4 and 6 November 2025, passengers travelling on Great Western services on route (00842) VIA TAUNTON from the southeast to, from or via Exeter may travel via Honiton. This fare route easement applies in both directions.
The data for easement 701389 now only applies to journeys which go via Carstairs (or the line nearby) and do not go via Berwick. This means you can no longer buy advance tickets via Dumfries, but there may be other effects. The text remains:
701389 (Fare route) During engineering works on the weekends of 13-14 and 20-21 September 2025, passengers travelling to Edinburgh and beyond with tickets priced on (00421) AP BERWICK whose normal route is via Newcastle and Berwick upon Tweed, may travel via Carlisle. This fare route easement applies in both directions.
The data for easement 701390 now says that it lets "via Bath Spa" tickets be used via Swindon. gwr.com wouldn't let me book a Chippenham-Bristol Parkway ticket using that route when I tried, though. The text remains:
701390 (Fare route) During engineering works between Bristol and Bath from 27 to 30 October 2025, passengers on Great Western services travelling between Chippenham/Melksham and the Bristol area with tickets routed (00831) VIA BATH SPA may travel via Swindon. This fare route easement applies in both directions.
The data for the "via Greenford" (00813) route has also changed. It had been restricted by train company, but now it's allowed for any journey via Greenford. I don't think you can actually buy a "via Greenford" Ealing Broadway-High Wycombe ticket with an itinerary though, even now.