The broadcast will show the event as it was filmed. A sea of candles. A children’s choir. Kate greeting guests with her characteristic calm and warmth. The royal family seated together. Musical numbers that mix traditional carols with contemporary arrangements. And, if the teaser is to be believed, one moment that could steal the show: the mysterious duet. Whether it will feature Charlotte, a returning collaboration with Tom Walker, or a surprise guest remains to be seen.

For many, the answer matters less than the feeling the service creates. Together at Christmas has quickly become one of the most emotionally resonant fixtures of the royal calendar. Its emphasis on unity and shared humanity stands out, especially in a year marked by loss, change and transition for the monarchy.

Everything points to tonight’s broadcast being a highlight of the holiday season. A service filled with music. A tribute to loved ones. A place where joy and remembrance sit side by side. And perhaps, under the watchful lights of Westminster Abbey, a duet no one saw coming.