Uk Visa Question

I have a quick qustion as I am leaving for the airport in a couple of hours,

On the visa application form Question # 4.11 " what was the reference number"

There are two numbers on wifes previous visa, a hand written number over the top of the visa and a printed number in the top right hand corner.

Which of these two numbers is the reference number.

I emailed the consulate last friday but as yet no reply and they will not accept phone calls until after 1.30 this afternoon.

Thamks