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Dahl, who was born in the Cardiff suburb of Llandaff, produced the sketches in black ballpoint pen for the book Boy, which was published in 1984.

John Pockett, a member of the Church in Wales for almost 70 years and previously Cathedral Steward and Intercessions leader at Llandaff Cathedral, called for the Archbishop of Wales to consider his position as head of the Church in Wales.

Hundreds of mourners are expected to attend the service at Cardiff's Llandaff Cathedral, including senior politicians past and present.

Thomas, 24, who admitted manslaughter but denied murder, had looked up details of the anatomy of the neck in the hours before the attack in Llandaff, Cardiff.

On the morning of the attack, Thomas was driven to Llandaff by his grandmother, Sharon Burton, who described him as becoming "more and more agitated" during the journey.