>> Last time I checked, BT ownes the entire telephone network. Nobody 
>> else is allowed to touch it.
> 
> And no other company manages similar (albeit smaller) such networks?  

No. That's why it's called a "government-granted monopoly".

> Sorry, but I'm just struggling to think what she does that wouldn't be 
> needed in any other company in the country.

The only company that needs to know about network diagnostics is... the 
company that runs the network. I would imagine.

(It also wouldn't surprise me if her contract forbids her working for a 
competetor for X years - but I haven't actually checked...)

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