Hello Sleepfox, thanks for your comment and it's not easy to date someone that you're interested in and who you work with, but it happens so many times, but the upsetting part is if you see them with another person, maybe at Xmas drinks or whatever, that's when you had only wished you had asked them out.
If you do happen to ask him and I'm sure that he would have noticed you looking at him, there will be times when you show pure devotion and times when you might have had a tiff, both may affect your work or perhaps it has already, but perhaps the latter of these may distract you more, but all relationships are exactly the same, whether you're working with each other or not.
At some point in life, 'you have to grab the bull by its horns', so do you know when he has a coffee break or lunchtime, then if it's the same time as what you have, then accidentally (on purpose) bump into him, don't forget he might be thinking the same way as what you're thinking and worry that you already have a partner, even though you haven't, doesn't mean that he knows this, then ask him something general, like did you watch the AFL grand final and who were you barracking for, there's nothing wrong with saying that, it's just a question many people would have been doing last weekend.
Watch how he reacts and if it's with a smile, grin and show of interest then ask him who he barracks for, then the conversation will develop, then each morning before work begins, be there to say hello to him with a smile, then he might be brave enough to ask you out.
Try and touch his hands by accident, this always draws 2 people together, ask him if he'd like to have a drink after work, don't worry about your nerves, this always happens even after you've dated many a person.
I'd love to hear what you think.