Posted: 04/10/2015 at 16:44
Yes, looks like leek moth or leek fly damage to me. They are both leaf miners and eat the leaf from the inside before pupating. See the RHS info on those two, here:
which also includes advice on dealing with each of them. Personally, given the damage levels, I would lift and use them asap. I lost a whole crop a couple of years ago and pulled them all but last year escaped any serious damage so sacrificing now may help you avoid the issue next year. Or not!