Daughter called me to look at immersion heater. The neutral connection had
failed. I trimmed back the cable and re-made the connections - but I felt a
bit un-easy as the terminals seemed quite poor - a post with a nut for N
and a small screw clamp in the thermostat for the +.

Are newer ones any better?

I am wondering if there is a better flexible that the one installed. Any
recommendations?