British Airways has ended effective immediately Skyflyer Solo service for new bookings, although all existing ones will be honored.
BA uses the Skyflyer Solo service name for basically unaccompanied minor service that parents had been able to purchase up to now. This means that children younger than 12 years old cannot fly by themselves without adult who is minimum of 16 years old.
You can access BA’s web page for this service here.
Many other airlines continue to provide this service. Just book away from BA.
This also means that parents cannot purchase seats for children younger than 12 years old in other class of service (usually lower) than what they are flying on.
Not sure why British Airways has decided to end this service considering that there are more families living apart and children or young adults are shuttling between parents or schools.