In reply to subtle:
Take the front wheel off, put it sideways on the ground with your hands on opposite sides and put a bit of downward force in, then flip over and do the same. Do this at a few points round the circumference, and see if you get the same noise. This will see if it's spoke related. I had a bike with super creaky spokes, took me ages to figure it out though.
To test the front end in general you could hold the front wheel between your legs and try and bend the handlebars side to side. If neither of these are your noise, then maybe try putting side to side force on the pedals without the bike moving to see if it is the bottom bracket or cranks (if the cranks are a bit loose you can get a similar noise)