New guidance issued by MI5's National Protective Security Authority (NPSA) suggests they consider creating a secure area to evade a 'potentially violent threat' when it is not possible to flee.

The new guidance was published online just three months before the killing of former Tory MP Ann Widdecombe.

New guidance issued by MI5's National Protective Security Authority (NPSA) suggests they consider creating a secure area to evade a 'potentially violent threat' when it is not…