During the two week closure of the West of England Line between Yeovil and Salisbury at the end of November, SWR have just confirmed that Network Cards will not be valid on the direct services that are diverted via Westbury. So if you have a Network Card you will have to use the replacement bus service taking up to 2.5 hours longer than usual. So for example, you leave London at 1350 and won't arrive in Exeter until 1944 which is also 2 hours after the 1350 arrives!