Farmers are reminded that they need to make sure that their fertiliser is secure.

The reminder comes as five men are convicted of an al-Qaeda-linked bomb plot in Britain which could have killed hundreds.

The men were planning to target a shopping centre or nightclub with a fertiliser bomb made from 600kg of ammonium nitrate.

The National Counter Terrorism Security Office has issued advice to growers about steps they should take to keep their fertiliser safe.