>> Is the issue possibly being caused simply by the lack of earth?
No, the lack of earth means your wife is no longer protected from getting a shock when it goes wrong, as she found out. Under certain circumstances it could have been fatal. (tho i have had numerous shocks and UK mains has not killed me yet)
>> Is there likely to be another issue. When I take it apart am I looking
>> for something simply like a faulty wire or connection, or is there another frequent cause?
In effect you are looking at a connection from live or neutral to the case or the outside of any component where there shouldn't be one, possibly where the cord enters the appliance is a favourite - the wiggle test will find that one.
>> I have meters and testers, and I'm assuming that there's just a 220/240v motor in
>> there with some kind of variable controls.
yup. pretty simple.
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