Theresa May says that the Metropolitan Police have made a number of adjustments to their arrangements ahead of London Marathon following Boston bombs.
Ms May says that although there was no COBRA emergency meeting following Boston, she was briefed on Tuesday and "appropriate people have been sitting round the table."
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Ex-Spitfire pilot Allan Scott, 94, said he was told off by the Queen when he first met her in 1943 when she was just 16.
Last minute preparations are going on at the Church of St Mary Magdalene where Princess Charlotte will be christened.
Princess Charlotte is being christened on Sunday at Sandringham in Norfolk in only her second public appearance since she was born.