It would be different if they were simulcasting the CBS Evening News or something in primetime, but this is a BBC branded bulletin and crucially it gives them half an hour (or is it an hour) of downtime in the UK and put all resources into the flagship 10pm bulletin which is far more important than whatever BBC News is showing in the 9pm hour.
(We're also still in that weird period when they've changed their clocks and we haven't).
Stay Home. Protect the NHS. Save Lives.
mat76 and what gave kudos