Don't forget though, there was a time when neighbours knew one another so well, there would be no questions in the minds of many neighbours what might be the problem with the child. They'd probably have "shared" to an extent, the care of their children, with each ones running in and out of their houses, and visits to and from wider family members would have created a wider safety net too. Those people, if the neighbour spoke to them, or knew where they lived, could provide an avenue to "have a quiet word", before even thinking of involving professional people or the police.
In the days of lockdown, a lot of this obviously isn't possible, and our UK government, and other agencies are saying how acutely aware they are of the dangers, with the enormous numbers of " blended families" adding another dynamic. What are those professional to do, given the pandemic, enter the home, creating risk, remove the child, have a hearing whilst the child is kept somewhere else, then look for more permanent foster carers, all things with degrees of risk aren't they, so long as Coronavirus is around, and "granny, and grandpa" anywhere else can't see their children/grandchildren.