trooping the colour parade to mark the king s official birthday. it s the first royal engagement she has carried out this year. the king, who is also receiving cancer treatment, travelled with the queen in a carriage, instead of riding on horseback as he has done in the past. charlotte gallagher reports. the princess of wales back in the public eye. riding in a carriage with her three children at the king s birthday parade. all eyes on her for her first appearance since her cancer diagnosis was announced. she was a huge draw for the crowds in central london today. this is a day full of tradition and spectacle, but it s also about family. the king and queen in their carriage. it s his first trooping the colour since his own cancer diagnosis, and he chose not to travel on horseback. the troops taking part have been rehearsing for months. every step, drumbeat and musical note has to be perfect. the irish guards are leading the event this year and their colour, or regimentalflag,