Just finished a day of rewiring the lights circuit in the kitchen - not
finished the whole lot yet, but the main lights are done.

Test it. Short between phase and earth. Arghhh. Track it down to a
section of cable with a crimp in. Hmmm. Cut out crimp, short disappears.
Remove the heatshrink, inspect cable. Can't find anything wrong.

Pull through some slack, remake crimp. No short. Get the hairdryer out,
and shrink the heat-shrink around the sheath. Short reappears.

It's not a dead short - it's 43ohms. I'm inclined to leave it overnight
and see what I measure in the morning....

Any ideas what's going on?!

Ben