I just got passports for me and DD, and the clerk at the post office kept saying that my photo would be rejected as the head was too big. Having had it printed out to specific measurements at the photo shop, then measured it myself at home I was sure it was Ok, so insisted he send it anyway. Two weeks later I have my passport as the photo was perfectly fine. I was not impressed by his attitude, and would be unlikely to use the PO checking service again. And it costs £7!!
No, I didn't complain - to be honest, I feel like what would have been the point?