Garage charged £50, bought the dash in parts off ebay. Cost around £100.
No I haven't seen the carbon effect, sounds interesting though.
To change the dash, took around 20 minutes. Most of that was trying to put the vents back into place, after they all fell out.
If you were to do it, there are cheap plastic trim removers, again off ebay.
I started by taking the OEM HU out, really easy just ease the stereo out with the trim removers.
Once it's out, look underneath the climate control panel, inside the dash. There are two torq screws you need to take out. I didn't see them at first, and nearly broke the whole panel. Once there undone, again use the trim removers to ease out the facia.
As you ease the panel out, look behind the climate control panel inside, as there are two more torq screws to remove.
You should be able to ease everything apart now. The main dash is really easy. There are only three torqs screws down the side, near the HU. Take those out, and use the trim removers to take it off.