Lord Deighton says to London Assembly member John Biggs that many tickets were sold below market value - 340,000 tickets were given to school children and troops.
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Assema Kedir Habib spoke at the commemoration of her brother Hashim Kedir and his family.
A 95-year-old man has been arrested on suspicion of murder after a 61-year-old female carer died after she suffered head injuries.
The man told his pensioner victim his floor needed replacing and offered to carry out the work.