the series in-house at their own production offices. Prior to this, post-production had been completed at 422 Manchester. As a result, the series lost its original editor who had worked on Most Haunted since the first episode and all of the vintage film composite effects which resulted in a considerable change to the editing style and look of the programme. For series six, beginning on 22 March 2005 with an investigation of Bodmin Gaol, David Wells became one of the main mediums alongside Derek Acorah appearing in every episode. This was Derek Acorah's last Most Haunted series owing to the controversy he was involved in during its production which cast doubt on his ability to perform his role. As such he did not appear in the final episode at Sinai House. The number of episodes for Series 6 was originally intended to be 18, with the last 11 being part of Series 7. Due to Acorah's departure, the series was extended. This was the first series in which the team conducted 24-hour investigations over in the USA. Acorah didn't return for the show's finale at Sinai House when David Wells was the main medium. Series 7–9 (Spin-offs and cast changes) The seventh series began on 1 November 2005 yet only ran for six weeks, shortened from an intended nine. Two of the final three episodes (at Bamburgh Castle and Chambercombe Manor) were broadcast at the end of Series 8 and the last, at Spitbank Fort, was broadcast as special on Boxing Day 2006. Parapsychologist Louie Savva a regular on the Most Haunted Live! events joined the team for a few of the investigations in this series covering shows which O'Keeffe was unable to take part in. Series eight began on 27 June 2006 with the 100th investigation and a revisit to Michelham Priory. It marked the last appearance of Richard Felix as the resident historian. He was not replaced until the tenth series. This series featured guest mediums Gordon Smith, Ian Lawman, Ian Shillito of Braintree, Essex and Kevin Wade. An investigation of South Stack Lighthouse began the ninth series on 2 January 2007. Four episodes into the series, new episodes became known as New Most Haunted in television listings and on-screen. This is the last series of Most Haunted where Most Haunted Extra accompanied each episode. After the first few episodes, Extra was moved to Living2. Most Haunted Extra