Which shouldn’t happen if he’s admitted to it, though I suspect it’s just standard procedure when only one person has reported something whatever the driver says – the guidelines for reporting says they’ll take no action if there isn’t another independent witness.
However, as in the title, I have an independent witness, so they can’t suggest that. I’m sure if the police had directly witnessed what happens they’d have pulled the driver for a word at least (it wasn’t just a driver passing too close, though my apologies as I’m deliberately avoiding giving details), let’s see what happens…