Pertwee loved planes, trains and automobiles and spent a lot of his tenure riding around in Bessie. Bessie only made one appearance during your run and a few other now and again. Did you not like the car? Or the producers? Or was it just considered an object of the old era and written out like the First Doctor's ring? I found myself wondering this the other day. XD
Si-Fy and Fantasy, that is where my heart lies. To Doctor Who and its 18 years of brilliance, still waiting on the 50 yr anniversary!