If it is planned engineering works that have been advertised in advance then the revised service is the service. So if the 2028 gets cancelled then it's replacement transport galore, however no replacement will be provided for the 2126 and 2240 as these were not scheduled to run in the revised...
1V52 0601 Glasgow Central to Plymouth 220006
1V56 0748 Glasgow Central to Plymouth 220016
1V58 0900 Glasgow Central to Penzance 221124
1V62 1100 Glasgow Central to Penzance 220001
1V66 1300 Glasgow Central to Plymouth 221120