Thanks for all of the kind words folks! I called him today and explained myself and apologised. He laughed, which is definitely what I hoped for! He'd said he hadn't take offense and that he'd not even given it a second thought.

Huge wave of relief, but still a lesson learnt and not something that'll happen again!

I was more contacting HR to get his work contact info, but didn't know how to explain the situation or what I could say. It kind of became an apology to him directly rather then a request for his info. But I will just figure out his info and contact him individually.

I hope he's ok. I would rather he gets a message or call from me and him laughing at me, then him being upset.

I haven't yet but I most certainly am going to. I more wanted to email HR to get his work contact info, but wasn't sure if he'd even want to speak to me or have an email from me. I'm worried that he perhaps went along with it all, to not cause a scene or something.

It's stuck in my head and this sounds weird but I wanted to give him some kind of ownership of choice back as he could choose to respond to me if emailed him or through HR, does that even make sense?