Utter fail here, I've tried every trick I usually use, nationwide, for each child's first name and approx year of birth and scanned down the results looking for possible mistranscriptions.
I've tried similar searches specifying another person in the household or the children's orphanhood status and still nothing.
I've even tried the Scotland 1921 census.
Sadly the enumerators schedule books (which we are used to seeing in pre 1911 census where the original forms were not retained) were destroyed in a fire.
and the original schedules can't be checked at the N.A. as they only give access to the FindMyPast database and we can't order and see the originals.
IF the form was missed when they were scanned, then your only hope is that when FindMyPast's contract for exclusivity expires another company may scan them and they 'may' turn up.
Sorry
Boo