I have a problem with the brake lights on my 420 staying on, lighting up as soon as the ignition is on without any pedal pressure. The car has standard rear lights and a 'Just Add Lightness' high level brake light. Just passed an MoT and all the lights have worked satisfactorily for over 1500 miles. I thought the problem would likely lie with the brake light switch but oddly this is working but in the reverse sense i.e. when pressed the lights extinguish. I changed the switch for a new metal one from Car Builders, as recommended on this forum for other brake problems, with the same result. Swapping the connections over on the switch does not make a difference. There is clearance between the switch and the plate attached to the pedal, it does not make a difference if the switch is loose from the pedal box. The brake light circuit is very simple and I cannot think of a reason why the switches would work in the reverse sense. Car electrics are not a strong point of mine, am I missing something obvious? David