Well, what you would expect to see in the place where the autoflex button cap would have been would be the autoflex button cap, as these cleaners originally came with an autoflex version, in beige. On the lilac model, the hole where the autoflex button would have been was capped off. The hole was on top of the bag unit, on the opposite side to the bag-full lamp. On this cleaner there is no cap. Instead the 2-speed on/off switch is fitted there, instead of in the handle.
A good few late Turbopower models had the one/off switch on the bag unit, but they had them on the side where the bag-full lamp would have been. However -and I have seen only three models like it- some had the on/off switch on the other side...like this one here.