I also called my Morgan garage now. They're always very experienced and helpful, as in this case. They confirm that the BPS sensor is a NO switch...so if the brake pedal is not depressed the circuit is closed.
According to the expert, the main purpose of this switch is that you cannot press the brake pedal and the accelerator pedal at the same time wanting to drive further. However, the expert has said that if both pedals are used repeatedly, the effect of stopping will remain off.
The reason is that if both pedals are pressed repeatedly, the driver's intention becomes apparent to the ECU and it will give way. The classic case is drying the brake after washing, where the expert says that he has to press both pedals (or just the BP, I forgot) twice and then the car will drive on with the brake and gas pedal pressed at the same time (of course gently).
If everything is in order and functional, then the ECU should ensure that driving is possible without disturbance even if the BPS circuit is closed. Because, as I understood it, the "decision-making authority" lies with the ECU. And it cannot intervene in this case if the BPS switch is removed. (Richard Wood says that triggers are possible in both directions, changing to open or to close, depending on the circuit, here it is the case obviously that it triggers when changing to open - activating by pressing the brake pedal down - when I am right).
But if, as in my case, the throttle closes unintentionally sporadically while driving, then I should leave the cable disconnected from the BPS switch, said the expert of my garage as well. Because it can be that the ECU itself does not "cleanly" keep it permanently "digitally open" when normal driving...or maybe the ECU needs an update. Because, with an update such irregularities are mostly repaired, so the experience of the expert.
At the end he said (very rightly) that I should continue to observe whether the error has really disappeared forever. The side-effect and great benefit is that the car drives better than ever before when she drove with the "digital" open BPS circuit.
So, all in all I am happy now and I will see if the failure keeps away, what I think it will. And others with the same issue can have an easy try, be it the repair of the interruption or addressing the overall throttle pedal quality.
