Glasgow Airport. It is to be discussed at Acpo’s annual conference this year.

In the most comprehensive research of its kind to date, Prof Martin Innes, of the Universities’ Police Science Institute in Cardiff, led a team of researchers which carried out face-to-face and telephone interviews with more than 600 Muslims in London, Birmingham and Oldham.

They found that the radicalisation of young British Muslims was more widespread than previously feared, with “a disturbing proportion” expressing support for extremist elements. The report, which is being distributed among senior officers, Whitehall officials and ministers, finds that:

• Anger and disaffection are “widespread in sections of Muslim youth”.

• There is tacit support for extremist violence within sections of the Muslim community.

• Police need to do more to win the trust of Muslim communities if they are to tackle radicalisation.

• Many Muslims distrust police and are reluctant to inform on extremists, preferring to deal with problems inside their communities.

The study, entitled Hearts and Minds and Eyes and Ears: Reducing Radicalisation Risks Through Reassurance Orientated Policing, warns that “the threat to the UK from jihadist terrorism may increase in the future”. It concludes: “Increasing numbers of young Muslim people are becoming sufficiently disaffected with their lives in liberal-democratic-capitalist societies that they might be willing to support violent terrorism to articulate their disillusionment and disengagement.”

Across Britain, the security services have said they are tracking 2,000 individuals suspected of having links to terrorism, investigating 200 networks and monitoring 30 plots. Professor Innes’s report warns that Islamist terror groups are increasingly operating away from traditional Muslim areas, and are seeking new ways to radicalise vulnerable young people. It comes as police investigate alleged terror plots in Exeter and Bristol.

Anti-terrorism detectives have remarked on the speed with which young people have been converted to extremism and become involved in operations. The report says: “Bringing people through faster might be a way of trying to limit the risks of detection prior to going operational. So whereas previously the al-Qa’eda network challenged state security services through using a small select cadre of skilled operatives, they might equally stretch capacity by mounting a larger number of less sophisticated attacks.”

A poll last year by Populus found that 13 per cent of Muslims aged 16 to 24 “admire organisations like al-Qa’eda that are prepared to fight the West”. Ministers have announced a £12.5 million “de-radicalisation” programme aimed at tackling Islamist extremism at local level. But Prof Innes says that in order for this strategy to succeed, police will first have to overcome widespread Muslim distrust.