I'm spending 12/16-1/1 with my girlfriend in London. I've been there many times before (in other seasons), but this will be her first time.
I'm sure she'll want to see the changing of the guard in front of Buckingham Palace. I understand that in winter it only happens every other day and the times may vary. How do I found out on what day and at what time there'll be a changing of the guard? I tried royal.gov.uk but couldn't find this info in their section on the Palace.

Yonatan