God knows, but I should imagine someone who spoke the correct eastern European language.
If they ended up in residential care long term then you may......just may.... almost have a point.
They were apparently placed with another white British family according to this BBC report, if that is the case then the council's position seems be untenable. But then this is the council, who on release of the report, released a press release whose first paragraph said the the report concluded that its child services were stronger and better co-ordinated. (See this twitter feed