Owner details from registration plate?

As above, it's quite possible and only takes a few minutes to get the details but you won't get access to the service or the information so best moving on with your litter crusade.
 
I know it was an older man because I overtook him and SCOWLED at him. He didn’t notice though.

Just to play the devil....

You took your eyes off the road , potentially while performing an at risk manoeuvre, to pull silly faces at someone who littered ? I would sure rather an extra bottle at the side of the road than meet you flying down the wrong side of the road scowling at someone.
 
@OP If he had thrown it out his car and it had landed on your window, maybe then you should do something about it.

In this case, as Fox said, get on with your life.
 
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