 The trial collapsed after evidence was given that the Queen had spoken with him regarding disputed events and a public-interest immunity (PII) certificate was presented by the Crown Prosecution Service.In January 2008 Burrell appeared as a witness at the inquest into the death of Diana.Burrell said he had approached a Catholic priest about a private marriage between Diana and the heart surgeon Dr Hasnat Khan, and denied rumours that Diana was about to announce her engagement to Dodi Fayed.