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

Huge crowds are gathering around Windsor Castle from the early morning. This is the Long Walk, where Harry and Meghan will process in an open-topped carriage after marrying.

There is an incredible amount of information out there about the wedding. Here are some of Business Insider's top picks to get you ready for the day.

The official titles Harry and Meghan will use in their married life were announced by Buckingham Palace this morning. The full order of service was released last night. We have a photo piece showing the chapel, covered in flowers for the wedding day. And here is a graphic showing how the ceremony will take place within the grounds of Windsor Castle. You can also read our complete royal wedding coverage here.

This is St George's Chapel, seen from the West Steps, through which Markle will make her grand entrance.

Here's the High Altar, where the climax of the ceremony will take place.

Meghan was last seen on Friday night with her mother, Doria Ragland, who will accompany her to the ceremony.

Harry and his brother William were seen the night before, when they came out of the castle to meet well-wishers.

It's safe to say lots of people were happy to meet him.