Fresh guidance aimed at preventing young people being drawn into terrorism has been approved by peers.

Home Office minister Lord Bates confirmed that guidance on visiting speakers at further and higher education institutions would be left to the next government.

But he said the emergence of Islamic State and the number of vulnerable young people "misguidedly" travelling to Syria and Iraq presented a "heightened threat to our national security".

Lord Bates said this was a "serious and growing threat" and as part of the response "we need to combat the underlying ideology that feeds, supports and sanctions terrorism and prevent people being drawn into that path".

The "prevent duty" would ensure a consistent response in all those bodies where staff worked on the "frontline with those at risk from radicalisation".

For Labour, Baroness Smith of Basildon welcomed changes made to the guidance after consultation.

But she questioned the inclusion of pre-school nurseries and asked what training would be available to staff to be able to spot "extremism and radicalisation in under-fives".

Lady Smith told the Lords: "I'm very unclear of the purpose and how it will work in practice."

Lord Bates acknowledged that the requirement did "sound strange" on the surface.

Teachers and nursery workers wouldn't be required to carry out "unnecessary intrusion into family life," but would be expected to take action "if they observed behaviour which is of concern".

He said this could include a small child "espousing some very strange views, or extreme views on anti-semitism" for example.

Challenged about the training that staff in schools, universities and other bodies would receive, Lord Bates said it would initially involve a "workshop" to raise awareness and "DVD-led" training to teach "frontline workers how to identify and support those at risk of radicalisation".

The DVD course was of around 30 minutes to an hour to introduce people to the "key themes" they ought to be aware of, he added.

Labour's Baroness Lister of Burtersett warned that teaching staff could be left "exposed" if asked to play an active role in preventing students being drawn into terrorism without adequate training.

She said that despite the changes the guidance still raised a number of "real worries, adding: "I'm not convinced that the guidance as it stands is sufficiently robust to guard against a chilling effect."

Independent crossbencher Lord Hannay of Chiswick welcomed the changes made after earlier criticism by peers and said ministers were "wise" not to rush into guidance on visiting speakers and lecturers.

The Counter Terrorism and Security Act 2015 (Risk of Being Drawn into Terrorism) regulations were approved without a vote.