Emmerdale S47 E12 Episode 8042 (Fri 12th Jan 2018)

Lachlan asks Dr Melville why Rebecca hasn't woken up yet. He brings up the possibility of Rebecca not waking up. Robert walks into the room and hears Lachlan asking about potentially turning off Rebecca's life support. He takes this as confirmation that Lachlan caused the accident and is trying to cover his tracks.