Gave them a second chance and they improved.

You got that right. Most British actors have been theatrically trained. This has its downsides but at least we can usually make out the dialog.

My hearing is not 100% and my system is cheap rubbish. I watch my movies late at night after my family have gone to bed and I try to keep the volume down lest the neighbors retaliate with a barrage of salsa and merengue. But that is no excuse for highly paid actors inability to enunciate simple phrases.