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A key intelligence database used by police to investigate extremists was "not fit for purpose" when introduced in 2014, a former counter-terrorism officer has told the Newsnight.

The officer, who retired in 2018, says the National Common Intelligence Application (NCIA) had serious flaws.

Counter Terrorism Policing says "substantial improvements" were made following a significant review after terror attacks in 2017, including at the Manchester Arena.

Newsnight has collaborated with BuzzFeed News on a detailed investigation into problems with the IT system, which cost hundreds of millions of pounds and was designed to allow police forces across the UK to share secret intelligence seamlessly.

Richard Watson reports.