If a Recurring Shift results in a shift falling on a day where no shift is required, such as a Bank Holiday, then an exclusion can be added to remove this date from the shift recurrence. If a different shift is required on this day instead then use a Shift Exception.
While Adding a New Shift or Modifying an Existing Shift, scroll down to the Recurring Schedule section and select Define Date Exclusions.
The screen expands to show the Exclusion entry section.
Add an exclusion date by clicking in the date box and selecting the date from the date picker.
Select the + to add the exclusion to the shift.
To remove an existing exclusion select the delete icon 
next to the date to be removed.
When all exclusions have been added select 
to save the shift.