I found the answer on the CIC web;- C, a- g% ~- F7 V8 u6 z8 y, S' o
"The certificate must have been issued no more than three months before you submit your application"/ M* w* y- P/ y/ | M
& P8 h% Z a8 J0 L3 R4 q8 A% O: BOurs were more than one year when we applied.