GWR strike service in Somerset

GWR has announced a limited service during new strike days called by the RMT union.
Unfortunately GWR are only providing a limited amount of information about the limited services.
The first strike day is 26 August. GWR will operate what it describes as a limited service on these Somerset lines:
Paddington to Plymouth via Castle Cary and Westbury. They haven’t clarified if the service will stop at Taunton.
Bristol Temple Meads to Plymouth. Again we were have yet to confirm if the service will stop at Taunton, Bridgwater or Highbridge.
The line from Westbury through Bruton, Castle Cary, Yeovil Penn Mill and Yeovil Junction will not be running.
The second strike day is Friday 1 September. No GWR trains will be running from any Somerset stations.
The final strike day (for now) will be Saturday 2 September. The Somerset service will be exactly the same as for 26 August .