... promoting the products of a private company?
That depends very much what kind of "private" company.
If it was your or my company - (hopefully) oohh no sorry can't do - security, data protection, abuse of a public office etc.
If, hypothetically, it was a "private" company owned / run by one of their mates / ex colleagues then (hopefully not) "Sure thing, Harry, I'll get the list copied off for you right away. Buy us a drink down the Lodge tonight, eh? Drop you the pendrive then ok?
But we all know that the Met are whiter than white, so impossible. Move along, nothing to see here.