Okay let's take a step back.
What panel are you actually trying to remove.?
The panel above the passenger footwell which incorporates the cup-holder. Sorry I can't describe it any better.
I found, and have undone, the two screws at the bottom of the panel, and have pulled out the clips up the side and along the top, but there is something still holding it in place either above or behind the cup holder. I don't want to use too much force in case I damage something.
You appear to have all the screws romoved etc except for the one behind the cup holder.
I have this panel off at least once a month to access my ECU and Vpro
You have to remove the complete cup holder assembly from the dash in one piece to access the bolt.
Pulling out the cup holder to the extended position is not enough.
If this is your issue then you have to pull out the cup holder to the extended position and with a thin flat blade screwdriver release the clip holding the complete unit to the dash.
Once the cupholder assembly is removed completely from the dash, then you will see the screw.
ALex.