King George VI's coffin is carried into Westminster Hall

The video depicts a solemn scene at Westminster, where three queens observe the cortege approaching. It reflects on the past grandeur when George VI last entered the House of Commons with great fanfare. Currently, the Lords and Commons are gathered in silence, while a guard stands vigil over the sleeping king in the Great Hall.

What is happening in the Great Hall during the ceremony?

Who is being watched over by a guard in the Great Hall?