I used to hate filling out that form, and others, as I always had to go into detail about being on ILR and then invariably I'd need to go in person and have the visa copied blah blah blah.
Such a relief to naturalise and then not have to bother with it.
Getting my childrens' passports was a 'mare because when DD1 was born, her nationality came from her father as I did not have ILR when she was born. Even so, according to the law, she could have it through me after I had ILR. But no matter.
When DD2 was born, again, I had ILR so it could have come from either parent, but her app was also first rejected, as was DD1's.
Only DS's went through without a hitch as I checked British on everything.
And again, the staff I dealt with were pricks who treated us, DH, too, like criminals trying to get a passport our children weren't entitled to.
I even had to stop Dh once, on the phone to some git in Belfast when he yelled, 'Look, y ou git, I dunnae ken wot part o' Scottish you dunnae ken but mah bairn is Scottish, okay, pal?!' :o