We were in a similar position. We applied this time last year. Basically, we didnt submit the P60 for the same reason and because all the relevant information is on the payslips anyway. The last payslip for the last tax year 2011-2012 has essentially the same info as the P60.
I would guess that all the ECO has to do is add up the gross pay on the submitted consecutive payslips to see what your hubby earned in the half year then double it......then bingo!![]()