Workers at Parliament have been issued with an exhaustive checklist of details to fill out if they receive a bomb threat.
The list includes questions such as "when is the bomb going to explode" and "why did you place the bomb" - presumably to ask anyone phoning in with a threat to blow up Parliament.
It also asks anyone receiving a bomb threat to:
• Record what accent and type of voice was used to deliver the threat.
• State whether the caller was well-spoken, incoherent, irrational or abusive.