Mairead Philpott has told Nottingham Crown Court she had no involvement with starting the fire at her Derby home or any plot leading up to the fatal blaze at 18 Victory Road.
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Jeremy Corbyn has challenged Theresa May to better fund the police and fire services by backing a Labour amendment to the Queen's Speech.
All 33 London councils were warned about "combustible" panels being used on buildings which could potentially spread blazes.
It happened at a rail depot near Daventry in Northamptonshire.