I found the answer on the CIC web; * N5 w3 A. `4 W( ]* J- A) P"The certificate must have been issued no more than three months before you submit your application"6 `8 Q4 b" \& k7 q6 F
1 J Y/ D& w1 F1 N/ T2 b3 W& F
Ours were more than one year when we applied.