§ Mr. McNamara
To ask the Secretary of State for Defence what is the total annual cost of staffing and maintaining surveillance towers(a) at the hilltop sites in the South Armagh area, (b) the two towers in Derry and (c) the three posts mounted on blocks of flats in Belfast. 
§ Mr. Doug Henderson
I refer my hon. Friend to the written answer given by my right hon. Friend the then Minister for the Armed Forces on 6 November 1997,Official Report, column 320.