Retailers will be required to alert MI5 and the police more quickly to "suspicious orders", such a large quantities of chemicals or odd behaviour when hiring a vehicle, under the government's new anti-terror plans.
Sajid Javid, the home secretary, will pledge to declassify intelligence on people suspected of having extremist sympathies to share with local councils, government and police to speed up the response to potential attacks.
He will also defend the controversial Prevent scheme, which has come under fire in the past for targeting specific groups in efforts to prevent people being radicalised.
In his first speech on security since taking up the post, Mr Javid will warn there has been a "step change" in the threat after the UK suffered a wave of terror attacks in 2017, including the deadly Manchester bombing where 22 people were killed at a concert last May.
His intervention follows the sombre memorial on Sunday to mark the first anniversary of the London Bridge attack, where three terrorists drove a van through pedestrians before mounting a knife attack in nearby Borough Market.
Ministers will work more closely with businesses to eradicate "safe spaces" for extremists, he will say, amid growing concern over the reduction in time between the conception and execution of terror plots.
Mr Javid is expected to say: “I’m committed to improving how we work with businesses across a range of issues.
"That includes faster alerts for suspicious purchases, improving security at crowded places across the UK, and reducing the vulnerability of our critical infrastructure."
Mr Javid will make clear his support for the Prevent programme, which he will describe as a "vital" part of counter terror efforts.
"Misapprehensions around Prevent are often based on distortions," he will say
"They are based on a lack of understanding about the grassroots work involved, and the efforts by civil society groups and public-sector workers to protect vulnerable people.
“We have a moral and social obligation to protect and support vulnerable people from the twisted propaganda of those seeking to radicalise them and Prevent is about doing just that."
Mr Javid will also announce plans to:
* Firm up proposals to increase maximum sentences for some offences, such as repeatedly viewing terror content online
* Outline a new approach to managing the rising threat from extreme right-wing violence
* Set out steps to enhance the use of data to track suspects by police and MI5
* Emphasise the need for collaboration with the private sector on tackling terrorist material online
Mr Javid, who is the first home secretary of Muslim heritage, will argue that right-wing extremists have more in common with Islamist terrorists than they think.
He will say: "These people want to destroy the values we hold dear, and undermine the freedoms that make us who we are.
“And there’s one other thing that Islamists and the far right have in common. As a Home Secretary with a name like Sajid Javid - I’m everything they despise.
“So the way I see it, I must be doing something right.”
Security services have warned that the Islamist terror threat will remain at its current heightened level for at least another two years, while the risk from extreme right-wing terrorism is on the rise.
The Home Office revealed that 12 Islamist and four extreme right-wing attack plots have been foiled since March, while MI5 and police are running more than 500 live operations involving roughly 3,000 "subjects of interest" at any one time.
More than 20,000 people who have previously been investigated could also pose a threat.
