Disruptions affecting the Bristol Parkway ↔ London Paddington corridor. Source: [GWR Planned Engineering](https://www.gwr.com/travel-information/travel-updates/planned-engineering). Last checked: 8 June 2026.
| Week | Dates | Severity | Bristol Parkway / London Impact |
|---|---|---|---|
| 10 | Sat 6 – Fri 12 Jun | MAJOR (Sat–Mon) | Severn Tunnel closure. London–South Wales trains diverted via Gloucester, not calling at Bristol Parkway. Some direct London–Bristol Parkway trains continue; otherwise via Bristol Temple Meads. Replacement buses Bristol Parkway–Newport. |
| 11 | Sat 13 – Fri 19 Jun | MAJOR (weekend) | West Country trains diverted via Bristol Temple Meads or Swindon. Trains depart much earlier than usual from London Paddington. Some services don't run at all. |
| 12 | Sat 20 – Fri 26 Jun | Minor | Late night/evening retimings only on main line. No major Bristol Parkway disruption. |
| 13 | Sat 27 Jun – Fri 3 Jul | Minor | Minor late-night retimings. Some Oxford/South Wales evening changes. No major Bristol Parkway disruption. |
| 14 | Sat 4 – Fri 10 Jul | MAJOR (all week) | All week: London Paddington–Bristol Parkway/South Wales reduced frequency, diverted between Swindon and Bristol Parkway. Trains depart much earlier than usual. Check journey before travelling, especially later in the day. |
| 15 | Sat 11 – Fri 17 Jul | MAJOR (all week) | All week: same as Week 14 — reduced frequency, diverted via Swindon, earlier departures. Check all journeys. |
| 16 | Sat 18 – Fri 24 Jul | MAJOR (all week) | All week: same pattern — London Paddington–Bristol Parkway/South Wales reduced and diverted. Some Bristol Temple Meads trains also retimed. |
| 17 | Sat 25 – Fri 31 Jul | MAJOR (all week) | All week: same pattern — reduced frequency, diverted via Swindon, earlier departures. Check all journeys. |
| 18 | Sat 1 – Fri 7 Aug | MAJOR (weekend) | Weekend only: same diversion pattern — reduced frequency, diverted via Swindon, trains depart much earlier than usual. |
• Weeks 14–17 (entire month of July) are the worst — all-week disruption every day on the London–Bristol Parkway corridor.
• Week 10 this week (Sat–Mon): Severn Tunnel closure means Bristol Parkway is not served by South Wales trains at all.
• Trains consistently depart much earlier than usual during disruption periods — check times carefully.
• Cycles and bulky luggage cannot be carried on replacement buses.