A few years back, my company leased 3 A320`s from Trans Aer, we were trained by Trans Aer in their S.E.P. and so different to ours, we too had juniors carry out cabin secure, then we as N01 & 2, followed and did our cabin secure, when we questioned this, all we were told that it was an I.A.A. requirement, not a C.A.A.