Tributes from across Welsh public life have been paid to Tony Benn whose death has been announced today. The First Minister Carwyn Jones called the veteran Labour politician a "man of great principle". The Manic Street Preachers called him a "total inspiration."
Neath MP Peter Hain described him as a "giant of socialism."
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Lukasz Pawlowski cut his throat with a kitchen knife as he was due to be sentenced in Havefordwest. He has been remanded in custody.
The peer will attack Prime Minister Theresa May for failing to represent the 48% who voted in favour of Remain.
Paul Flynn, MP for Newport West, will open the debate in Westminster Hall.