Warrant Officer called my work

[Cinnamontoas]

Yesterday I answered the phone at work to someone claiming to be a warrant officer.
They wanted someone who no longer works at the company.
They were really pushy and rude and threatened to come down to my workplace to check if I was lying.
What is a warrant officer? Does this sound like a scam?

To check if you were lying? I’m afraid I would have hang up the phone when someone spoke to me like that, regardless of how important they present themselves.
And if they do show up at your work they can show a court order to prove that they have a right to even ask you that information and act civil and professional if they want you to cooperate. These kind of veiled threats would piss me off.

I think that's why it's got under my skin, I felt there was an underlying mysogeny.

Yes, I highly doubt they would be so rude and patronizing towards a man. Because they knew they would get shouted at.

Is a 'warrant officer' (outsider of a military context) the bailiff equivalent of a 'common-law husband/wife'?

Either way, I wouldn't do their job for them, whatever that job is.

Baliffs don’t behave in that random fashion

Hmm, IME some will do/say whatever they can to get the information/money they want, including intimidating people by making out they have powers of arrest and detention when they don't, or they have court orders/arrest warrants when they have liability orders. The ones who wear body cams are usually much more professional and don't mislead about their powers, because they stand to get caught and can have their bailiff license revoked.
Those ones were quite hot on trying to scare you into proving a negative (prove you don't own that random car I've levied, prove you're not married to X)
There may be tighter regulations now though, my experience with them was years ago.

It may well be a common or garden bailiff having given themselves a grand title to sound more intimidating to scare people into cooperation - I found that telling them to go ahead and do whatever they were threatening usually did the trick because they actually couldn't do any of the things they claimed - I was told once my door would be bashed down and I'd be arrested if I didn't answer - I told them that if they had those powers then they could use them and this could all be sorted out at the police station when they took me there - funnily enough I never heard from them again and continued to pay the debt I was already paying until it was paid off - without being arrested by anyone.

We used to get private detectives using this tactic. My monies on a PD or bailiff. You don't have to share anything with them. I'd be cautious incase you are tricked into sharing information
Put the phone straight down