Across the GWR network, some trains may be altered / cancelled due to the May Day Bank Holiday.

In particular, the following trains to or from London Paddington will not run:

0341 Swansea to London Paddington
0510 Bristol Temple Meads (via Westbury) to London Paddington
0533 Bedwyn to London Paddington
0612 Frome to London Paddington
0739 Reading to London Paddington
0838 London Paddington to Westbury
0920 Newbury to London Paddington
1523 London Paddington to Worcester Foregate Street
1808 London Paddington to Frome (will run from London Paddington to Newbury)
2317 Reading to London Paddington

On Monday 6 and Tuesday 7 May:

* The 2306 Bristol Temple Meads to Westbury will terminate at Bath Spa at 2323. A replacement bus will run as follows:
Bath Spa 2330 - Freshford (Old Bakery) 2348 - Westwood Village (for Avoncliff) 2355 - Bradford-on-Avon 0011 - Trowbridge 0025 - Westbury 0040

On Monday 6 to Thursday 9 May:

* The 2030 Cardiff Central to Bristol Temple Meads will terminate at Bristol Temple Meads at 2121. Passengers travelling beyond Bristol Temple Meads should travel on the 2148 departure to Portsmouth & Southsea, which will call additionally at Dilton Marsh (on request) at 2235

* The 2345 Bristol Temple Meads to Frome will not run. Replacement buses will run as follows:
# Bristol Temple Meads 2345 - Keynsham (Church) 0001 - Oldfield Park (Lower Bristol Road) 0015 - Bath Spa 0020 - Bradford-on-Avon 0046 - Trowbridge 0100 - Westbury 0115
# Bristol Temple Meads 2345 - Keynsham (Church) 0001 - Oldfield Park (Lower Bristol Road) 0015 - Bath Spa 0020 - Freshford (Old Bakery) 0038 - Westwood Village (for Avoncliff) 0045 - Bradford-on-Avon 0101 - Trowbridge 0115 - Westbury 0130 - Frome 0148

* The 2123 Portsmouth Harbour to Bristol Temple Meads will terminate at Westbury at 2330. A replacement bus will run from Westbury at 2340 to Trowbridge 2358, Bradford-on-Avon 0010, Bath Spa 0040 and Bristol Temple Meads 0110.

The 0018 Henley-on-Thames to Reading will terminate at Twyford at 0030. An alternative rail connection will run from Twyford as follows:
On Tuesday at 0046 to Reading arriving at 0053.
On Wednesday to Friday at 0040 to Reading arriving at 0050.