A police raid on a leading TV production company, seizing footage for a Seven Network “true crime” series, has dramatically escalated an inquiry into an alleged conspiracy to pervert the course of a murder appeal.

The NSW Police raid on CJZ productions in Chippendale, Sydney, in recent weeks, is part of an ongoing Tasmania Police investigation into an alleged conspiracy to pervert justice in the appeal ­application by convicted killer Susan Neill-Fraser.

Two people have been charged and Tasmania Police — now viewing the hundreds of hours of footage seized in the Sydney raid — have flagged the potential for further charges.

Neill-Fraser, 62, is serving 23 years for the murder of her long-time partner, Hobart radiation physicist Bob Chappell, on board their yacht, the Four Winds, on or about Australia Day 2009.

Acting on behalf of Tasmania Police, a NSW detective with a warrant seized CJZ footage of ­interactions between people ­potentially caught up in the investigation, which police allege ­involves a plot to present false evidence to Neill-Fraser’s current appeal application.

The Australian understands the footage was sourced from filmmaker Eve Ash’s company, Seven Dimensions. Ms Ash has interviewed a number of people claiming to have new information about Chappell’s disappearance, while another filmmaker and former policeman, Colin McLaren, has helped dig up allegedly new information …

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Matthew Denholm, The Australian