I had a light out on one of the three heater control knobs. Advice on here was they just clip into place. This is somewhat true but only once you have removed a bit of other plastic trim. The plastic which the three heater control knobs lighting are fitted to is held in place by 7 push fit clips and a section of plastic behind the dash facia.  The dash facia is held in place by 10 push filt clips and a small section is behind the speedo surround. So the process to get to the