I think Starmer is reacting fine in not hesitating, Mandelson has no right to be in the H of Lords, he left the party before he was sacked, not an ounce of sympathy left after its all come out.
It seemed a good appointment at the time ie fire to fight fire, but no one in the Labour Party has tried to protect him once this stuff started coming out.
It's good that UK journalists are investigating and maybe have more freedom to do so, it maybe that our journalists uncover some "interesting" information about leading US figures in their investigations.
The whole corrupt mess needs to be exposed. The money, the abuse, the lot.