At the last Sydney SMT, a few guys mentioned that my brake lights flickered on and off, all the time, even when it seemed that I wasn't braking. Not coincidentally, my cruise control has been busted since forever, so I decided to have a look at the pedal position sensors.
The clutch was fine, but the brake light switch (that thing with the brown plug in the foreground) was maladjusted.
When the brake pedal was at its unpressed-position, the freeplay in the pedal would let the switch go past its click-point, and hence trigger the brake lights and disable the cruise.
The switch didn't look adjustable, so I adjusted the brake pedal position instead...unwound the pushrod (that shaft on the right with the spherical joint on it) half a turn, and buttoned it all up again. That was enough to compress the switch, so that the brake lights didn't come on until you got to the *end* of the pedal freeplay, and the cruise control seems to be all tickety-boo again. Thankfully, a nice easy fix.