Follow instructions for removing dash down tubes HERE
Remove the four screws holding in head unit and remove unit. You can then undo two screws holding in heater controls. You need to remove two of the clips that the dash down tube screws into (normally blue) that are either side of the heater controls. Should be able to then release the heater control clips and push the whole unit back (may need to disconnect the heater cables beforehand). You then have to manoeuvre and twist the heater controls to get them out. Awkward job but easier than putting it back in again
Once removed you will find the fascia is clipped on.