International Development Secretary &lt;a gi-track='captionPersonalityLinkClicked' href=/galleries/search?phrase=Justine+Greening&amp;family=editorial&amp;specificpeople=2466449 ng-click='$event.stopPropagation()'&gt;Justine Greening&lt;/a&gt;, former British Prime Minister Sir John Major and The Countess of Wessex at The Royal Society in central London during an event hosted by The Queen Elizabeth Diamond Jubilee Trust to mark the day Queen Elizabeth II became the longest serving Monarch on September 9, 2015 in London, England.