Go to Outlook > Calendars
Right Click 'My Calendars' > '+Add Calendar' > 'From Internet'
Enter https://www.robinson.cam.ac.uk/robinsonwings.ics
Click 'Yes' when asked to Add Calendar to Outlook and subscribe to updates
Goto https://outlook.office.com/calendar/addcalendar
Choose 'Subscribe from the web'
Enter https://www.robinson.cam.ac.uk/robinsonwings.ics
Goto https://calendar.google.com/calendar
Click 'Other Calendars' > '+' > 'From URL'
Enter https://www.robinson.cam.ac.uk/robinsonwings.ics then click 'Add Calendar'
The Robinson Wings Calendar is a standard ICS file, please consult your email/calendar client documentation on how to add and ICS calendar, and use the https://www.robinson.cam.ac.uk/robinsonwings.ics as the URL.