Feel through the leather gaitor at the side nearest the dash.
There are two clips as you feel through, flick them up and then slide the base of the gaiter towards the handbrake and lift it up.
Pull it right over the knob so you can see the fitment, pull of with a pair of pliers then refix on with a jubilee clip... once the clip is removed it cannot be reused.
Then push all back in place, including the clips - job done.