A whole bunch of the Cardiff to Nottingham XC services are cancelled as well (my sister was booked on one of them). Last minute cancellations "due to a shortage of drivers" are common on this route but cancelling a load in advance for several days seems to be a new thing.
XC seems to be well screwed all next week. Looks like my sister gets an hour at Birmingham instead of a 15 minute change at Birmingham.
Edit: I've found
this page which says they are changing the timetable for the entire week's runup to Easter, but doesn't really explain why this change applies to the Monday to Thursday.
Quote: