This weekend I removed the front bumper of my 2016 Octavia III 1.6 SE L TDI Estate. I used my TRX 25 bits in my socket set. At the bottom there are 8 bolts instead of 6 on my car. Removing the internal bolts on the side, behind the headlights was a struggle. The reason I could not get the TRX 25 bit in was that they filled up with crud so I used a small scraper to clean them out first. In my 1/4" socket set I have a 15cm flex extension bit which I mounted on the socket screwdriver (?) together with the TRX 25 bit. With one hand near the bolt I guide the bit and the flex extension to its place vertical on top of the bolt. The screwdriver is almost horizontal when I start to turn it anti-clockwise. This is how I unbolt the hidden bolts. In that same location there are 2 additional pesky lugs that hold the bottom bumper to the top front side panel. I prised those carefully loose with a small screwdriver. This connection is a weak point and there is a good chance the connection breaks at some point, with small cracks becoming big cracks over the years. I attach a photo of the front bumper left side where the yellow arrows indicate the location of the TRX bolts, the red arrows indicate the lugs and the blue arrow indicates a metal clip. Just underneath this bumper ridge is a small metal bracket with screw threads for the bolts.