They were held under Section 41 of the Terrorism Act 2000 on suspicion of involvement in the commission , preparation or instigation of acts of terrorism .
Badat was arrested under section 41 of the Terrorism Act “ on suspicion of involvement in the commission , preparation or instigation of acts of terrorism , ” Scotland Yard confirmed .
Sandy Mitchell , 44 , from Kirkintilloch , Glasgow , and William Sampson , a British citizen born in Glasgow , face beheading in public .