This morning, the Queen makes her journey from Buckingham Palace to the Houses of Parliament in order to open the Parliamentary session for another year. She's not the only one to be making the journey, and if you keep your eye out you will be able to see a number of royals and hangers-on all dressed up in their finery. The Crown even has its own carriage.
Down on Whitehall and Parliament Street, guards line the route and military bands play to anticipate her arrival. The Queen arrives in a horse-drawn coach, entering through Sovereign's Entrance under the Victoria Tower. The Royal Standard is then raised over the Houses of Parliament and remains in place until she leaves.
She then dons the Robes of State and the Imperial State Crown in the Robing Chamber, using a small worn throne that has been used by every monarch since Queen Victoria, and then proceeds through the royal gallery, usually accompanied by the Duke of Edinburgh, to the House of Lords, where there is a grander throne upon which she sits.
After the summoning of the Members of the House of Commons by Black Rod, she then gives a speech to announce the legislative programme for the next Parliamentary Session, which as it can only last until June at the very latest, is likely to be a controversial one this year.
Your author could go on about this forever, but probably best for him not to. If you are interested, please have a look at http://en.wikipedia.org/wiki/State_Opening_of_Parliament