Royal wedding live: Guests have started arriving for Prince Harry and Meghan Markle's lavish ceremony

The royal wedding of Prince Harry and Meghan Markle is underway, and Business Insider is covering proceedings as they happen.

The bride and groom are not expected to be seen at Windsor Castle, the site of the ceremony, for another hour or so.

But guests have already started arriving, and the streets of Windsor are thronging with thousands of well-wishers.

Scroll down to see the day as it unfolds - and click here for the latest updates.