I've not found a single child registered as "evacuee" though there are some mystery children in some houses, mostly redacted - and known children missing from some city households.
I have however found two adults named as "evacuees" - one with 3 redacted below her, presumably her children. The other is more interesting, a woman of 38, known to be childless, a Londoner found in her father-in-law's home village (Byfield, Northants) but with a couple not believed to be related. Her husband was not found - already in the services, like a lot of younger men?