Most of these seem to have been released / imported in the 1980s. These later T's often went into stock as 'Scopeless' - a rifle in a transit chest as a spare part - awaiting a need and the addition of a scope and bracket - plus all the other CES.
Some of these rifles seemed to have laid in stores until the end of the war and then them and and the remains of the BSA marks were furiously converted to T status by H&H while the contract lasted. Similarly Savage rifles that are genuine and completed to a fully scoped 'T' are rare and early.