@BilgeRat: This is possible through the Google Calendar, I believe. Please download the Google Calendar app > Open the app > Tap the 3 lines in the top left > Settings > More > Holidays > Tap on the UK. Now, open the the Samsung Calendar > Tap the 3 lines in the top left > Tap on the drop down arrow next to your Google account, and make sure that Google Calendar is ticked. Let me know if this helps.
