Naseer, 26, was arrested in 2009 along with 11 others in counter-terrorism raids in Manchester and Liverpool but no one has been charged by British prosecutors.
Eleven of the arrested men were Pakistanis, most of whom came to the UK as students. British intelligence services suspected they were part of an international al-Qaeda plot directed from Pakistan and Abid Naseer was said to be the leader of the British end of the operation, the report said.
Suspicions were first aroused because of intercepted email exchanges between Naseer and an al-Qaeda suspect in Pakistan known as "Ahmad".
Police made their arrests on 8 April after an email about a Nikkah (Islamic wedding ceremony) which was believed to have been code for the attack. It read "I met with Nadia family and we both parties have agreed to conduct the Nikkah after 15th and before 20th of this month."