WE had a firm out ot ours(hotpoint washer dryer) years ago as the heaty bit did not work.
The man came in without his toolbox, carrying only a screwdriver.
I asked him if he wanted a cup of tea, he said, "no thanks mate only be here two mins then it will be fixed", confused as I was I watched as he undid the back of the w/d put a wire back on and tested it all ok, perfect.
I said how did you know, he said they always leave them off, so I said but aren't they tested ?, so he said I'm sure you can work that one out!!
tabetha