Kate joined the Duke of Edinburgh and the Queen at the Baker Street tube station to celebrate 150 years of the London Underground. This was an event that Kate simply took an interest in and suggested she accompany the Queen and Duke. Richard Palmer reported at the time: "'She just fancied it. She asked if she could come along,' a senior royal aide said."
Location: England, Europe, London
Event: Daytime Event, Public
Venue: Baker Street Tube Station