How to reset a Unidare or Newlec storage heater ?

I (stupidly) tried to dry some clothes on our storage heaters after moving into a new house two weeks ago.

Now, two of the heaters wont work. Though the red light, next to the wall plugs, are on at night. I am assuming that the cut out switch has been triggered. But despite opening up the heaters, I can't find the bless'ed switch for the life of me!

Any ideas?

1 is Unidare WMs724N very old
2nd is Newlec NLSH12AN about 5 years old.

HELP, it is freezing and my wife won't stop complaining.

Thanks