Major UK rail strikes and national travel disruption - I am interested in impacts to the routes from London to Cornwall

As of 16 July 2026, the heatwave-related travel disruption on Great Western Railway (GWR) services has concluded, with the network returning to a standard timetable on 13 July. There are currently no national or localized rail strikes scheduled for the remainder of July 2026 following the completion of previous industrial action. Passengers on the London to Cornwall route should note a planned diversion of the 'Night Riviera' sleeper service on 26 July due to engineering work.

• Heatwave Disruption Ended: GWR and National Rail confirmed that service amendments and speed restrictions due to extreme heat concluded on 13 July 2026, with services returning to normal operation.
• No Upcoming Rail Strikes: As of 15 July 2026, no further industrial action has been announced by the ASLEF, RMT, or TSSA unions for the UK rail network for the rest of the month.
• Night Riviera Sleeper Diversion: Engineering work between Exeter St Davids and Taunton on Sunday 26 July 2026 will cause the 'Night Riviera' sleeper service to be diverted via Honiton, resulting in an arrival in Penzance approximately 30 minutes later than usual. 📅 Calendar file (.ics) Night Riviera Sleeper Diversion July 27, 2026 at 00:15 GMT+3 – July 27, 2026 at 11:00 GMT+3

As of 14 July 2026, travel between London Paddington and Cornwall remains affected by an ongoing heatwave, with GWR operating an amended timetable on 13 and 14 July. While the national TSSA strike concluded on 11 July and the 'essential travel only' advice has been lifted, localized RMT industrial action on the Transport for Wales network impacted evening connections on 12 and 13 July. Passengers are also alerted to a planned diversion of the 'Night Riviera' sleeper service on 24 July due to engineering work.

• GWR Heatwave Service Amendments: GWR is running an amended timetable on 13 and 14 July 2026 due to temperatures exceeding 30°C, with local services between London Paddington and Reading running non-stop to protect infrastructure from heat-related damage.
• RMT CAF Rail Strike: RMT members at CAF Rail (Transport for Wales contract) held evening strikes on 12 and 13 July 2026, which may have affected regional connections for passengers travelling to or from Cornwall via the West of England.
• Completion of TSSA Strike: The national TSSA industrial action that disrupted connecting services concluded on 11 July 2026, and GWR services have returned to a standard schedule, though heat-related speed restrictions remain in effect.
• Future Night Riviera Diversion: Engineering work between Exeter St Davids and Taunton on 24 July 2026 will cause the 21:45 Penzance to London Paddington sleeper service to be diverted via Honiton and skip its scheduled stop at Taunton. 📅 Calendar file (.ics) Night Riviera Sleeper Diversion July 24, 2026 at 23:45 GMT+3 – July 25, 2026 at 08:00 GMT+3

As of 11 July 2026, travel from London Paddington to Cornwall remains heavily disrupted by a severe heatwave and industrial action. GWR issued an 'essential travel only' warning for 10 July as temperatures reached 34°C, leading to speed restrictions and the cancellation of several services between London and Reading. While GWR staff are not on strike, the national TSSA walkout on 10 and 11 July has significantly reduced connecting services, and passengers on the Cornwall route face further changes on 12 July due to early morning engineering works.

• GWR Essential Travel Only Advice: On 10 July 2026, GWR advised passengers to travel only if absolutely necessary due to a 34°C heatwave causing potential track buckling and overhead line failures, particularly on the route out of London Paddington.
• Thames Valley Service Amendments: Between 09:30 and 21:00 on 10 July, GWR local services ran non-stop between Reading and London Paddington to protect infrastructure; passengers for Slough, Maidenhead, and Twyford were diverted to the Elizabeth line.
• TSSA Strike Impact and Ticket Acceptance: The TSSA strike on 10 and 11 July 2026 has crippled West Midlands Trains; GWR is providing ticket acceptance for affected passengers between Worcester Shrub Hill and Hereford, increasing passenger volume on some connecting South West services.
• Sunday Engineering Work for Cornwall Route: Engineering work between London Paddington and Southall on 12 July 2026 will cause early morning Penzance-bound trains to depart up to 11 minutes earlier than scheduled (e.g., the 08:04 departure will leave at 07:53). 📅 Calendar file (.ics) London-Penzance Engineering Work July 12, 2026 at 03:00 GMT+3 – July 12, 2026 at 15:00 GMT+3

As of 9 July 2026, GWR services from London Paddington to Cornwall are experiencing disruption due to a combination of high temperatures and a fault with overhead line equipment between London and Reading. While GWR is not directly targeted by the TSSA rail strikes on 10 and 11 July, a preliminary 24-hour walkout by roster clerks began on 9 July, contributing to national travel uncertainty. Passengers are also advised that the major engineering project between Swindon and Bristol Parkway remains in effect until early August.

• Heatwave and Overhead Line Disruption: On 9 July 2026, GWR implemented an amended timetable between London Paddington and Reading until 21:00 UTC due to temperatures exceeding 30°C and a fault with overhead electric wires, causing cancellations and delays to West Country services.
• TSSA Strike Commencement: A 24-hour strike by TSSA roster clerks began at 00:01 UTC on 9 July 2026, ahead of the main industrial action scheduled for 10 and 11 July which will significantly reduce services on London Northwestern and West Midlands Railway.
• Penzance to Plymouth Service Recovery: Disruption between Penzance and Plymouth caused by a shortage of available trains was officially cleared on 8 July 2026, though through-services from London remain subject to other national delays.
• Ongoing Swindon to Bristol Engineering: The four-week engineering project between Swindon and Bristol Parkway continues to affect the frequency of services from London Paddington to Cornwall, with works scheduled to conclude on 2 August 2026.