Cough, cough check this
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I'm regularly near Ealing Hospital if you want to meet up!
shameless plug
Edit: I currently use it along with bibios Gizmo thingy and they work flawlessly. The intelligent auto off system, is also actually meant to switch off once it detects no "noise" in the circuit once the ignition is switched off, so it should switch off before the voltage even drops to the level it states. When i tested them before installing it with Bibios gizmo, that's exactly what happened. But I just went for the peace of mind option and used the "gizmo"