Facts:

Alhaji Umaru Dahiru (plaintiff\1st respondent) was issued a Right of Occupancy by the Minister for the Federal Capital Territory (1st defendant\2nd respondent) over plot no. 109 Wuse II, FCT Abuja covered by Certificate of Occupancy no. FCT/ABU/BA.50 and in 1994 Alhaji Dahiru applied for approval of a building plan and a letter conveying the approval for development was forwarded to the Minister. Both documents were tendered at the trial as exhibits B and C respectively.

However, while Alhaji Umaru Dahiru (plaintiff\1st respondent) was carrying out the development of his plot, the Federal Capital Development Authority (FCDA, 2nd defendant\the 3rd respondent) came and demolished the development put by the plaintiff and upon enquiring, the plaintiff discovered that his right of occupancy had been revoked. He therefore brought an action in the Federal High Court against the Minister, the FCDA and later against the Network Security Limited as the 1st, 2nd and 4th defendants respectively. During the pendency of the suit in the Federal High Court, the FCDA sold the plot in question to the Network Security Limited, who was later joined as the 4th defendant in the suit