The judge ruled that identification evidence from Duwayne Brooks, a friend of Stephen's, was inadmissible.
Mairead Philpott's son from a previous relationship, 13-year-old Duwayne, died later in hospital.
Mrs Philpott's son from a previous relationship, 13-year-old Duwayne, died later in hospital.
BBC: Derby fire deaths: 'Possible' that Mick Philpott set fire
The officers' prejudice led them to leave Duwayne Brooks, Stephen's friend and the key witness to the crime, "side-lined and ignored".
Mrs Philpott said she watched TV soap operas with Jade and Duwayne and they went to bed about an hour later.
Mrs Philpott's son from a previous relationship, 13-year-old Duwayne, died in hospital.
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Their brother Duwayne, 13, died two days later at Birmingham Children's Hospital.
Jade Philpott, 10, and brothers John, nine, Jack, eight, Jessie, six, and Jayden, five, died on the night and Duwayne, 13, died three days later.
BBC: Derby Philpott family fire deaths prompt coroner appeal
As it was, Stephen's companion that night, Duwayne Brooks, was so unreliable that the court refused to allow his evidence to go before a jury.
Jade Philpott, 10, John, nine, Jack, eight, Jesse, six, and Jayden, five, were killed in the fire in Allenton, while 13-year-old Duwayne, died later in hospital.
Jade, 10, and her brothers John, nine, Jack, eight, Jesse, six, and Jayden, five, died at their home and brother Duwayne, 13, died three days later.
The court heard the children's father, Mick Philpott, 54, had identified the bodies of five of the children on Monday, after spending the weekend at Duwayne's bedside.
BBC: Derby Philpott family fire deaths prompt coroner appeal
Doreen and Neville Lawrence and Duwayne Brooks were given a detailed explanation of the advice to police by the reviewing lawyer at meetings prior to the CPS's announcement.
BBC: NEWS | UK | England | London | CPS rules out Lawrence prosecution
Their brother Duwayne, 13, died three days later in hospital.
Duwayne, 13, died three days later.
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Other guests included pop star Emeli Sande, Duwayne Brooks - Stephen's friend who was with him on the night that he died - and lawyers Imran Khan and Michael Mansfield who have represented the Lawrence family throughout their battle for justice.
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