dennis wrote:
As a matter of interest, who do you use to test the freezer and tumble
drier, etc? And what does the test consist of?

He supplies and tests it so he can be held responsible when it catches
fire and kills someone. He will be OK as long as his insurance is good.

The manufacturer tests them. I buy them new from a reputable supplier,
and replace them every five years or so, and keep all the paperwork. My
insurance has the option of persuing the manufacturer for "non-merchantable
quality".