How The Crown filmed Queen Olivia Colman riding under the Buckingham Palace arches in series four

Olivia Colman as the Queen rides out of the gates of Buckingham Palace to greet an adoring crowd. In reality, it was filmed several miles away at Elstree Studios, Herts. https://www.dailymail.co.uk/tvshowbiz/article-8925299/How-Crown-filmed-Queen-Olivia-Colman-riding-Buckingham-Palace-arches-series-four.html?ns_mchannel=rss&ns_campaign=1490&ito=1490