Mk3.5 Focus Creaking Noise When Depressing Clutch / Gas Pedal

So, here's the story in a nutshell.

I have my 1L (125) Zetec S for a good couple of months now, which was purchased new end of last year. In the past weeks/month I started to hear a creaking noise when depressing the clutch / gas pedal when the car is in gear, any only when it's in gear (most audible when in lower gears). This mainly happens when the car is cold and after about half an hour or an hour, the noise fades away. During that time the noise can be lower or higher, and if you listen to radio you can barely hear it, but since I know what I need to look for I can kind of hear it whatever and whenever.

Been to Ford twice, once they sprayed some WD40 at it, but it didn't make a difference, the other time they didn't do a single thing, just kept me waiting for 1.5 hour (dash cam is my friend), will put a complaint letter together soon to that lovely branch. Obviously, I've searched the whole internet and it seems some other people had this issue, but couldn't find a straight answer what could the issue be.

Here's the issue in motion picture format, turn the speakers up:

https://vimeo.com/152181707

Anyone got any idea, what could this be? Much appreciated, as always.