The Queen is said to be determined to travel to London to mark the life of her husband Philip in what would be her first major public engagement away from Windsor Castle in nearly six months
The monarch, 95, has rallied to make an appearance and lead her family at the high-profile and personally significant occasion in honour of husband Philip.
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The PM and his wife Carrie (pictured, in Sussex over the weekend) are set to join a congregation of 1,800 people as they gather at Westminster Abbey today.