Test and evaluation of military electronic systems. Military defence services. Air defence radar. Air Defence flight checking contract — the contract will be for a duration of 3 years with the option of 2 further 12 month extensions. The contract is for the provision of Air Defence Flight checking — Flight checking will be required to cover the following AD Radar locations in Benbecula, Buchan, Brizlee Wood, Portreath, Saxa Vord, Staxton Wold, Trimingham.