The hearing into the deaths of Diana and Mr Fayed lasted more than 90 days with evidence from around 250 witnesses.
The inquests concluded on April 7 2008, with a jury returning a verdict that the "People's Princess" and her boyfriend were unlawfully killed.
After the hearing, the Metropolitan Police said they had spent £8m on services arising from the inquest and the Operation Paget investigation from 2004 to 2006.
That money includes the cost of the legal team which represented the force's commissioner at the inquest, police protection for the inquest jury and paying for the Paget inquiry, reported to have cost £3.6m.
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