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It does normally start working quite early, I don't have to drive very far before it kicks in but I have noticed it has a tendency to turn the car back on if you are sitting for more than a few seconds.

What's the steering noise you mention? They all seem to make a sound on full lock but I don't think its anything to worry about, just the PAS pump doing its work I believe.
 
Did it seriously turn the engine off whilst you where driving the car at 20mph? I really struggle to believe that, sorry. Only possible explanation I can think of is something caused the engine to stall, but there is no way the start/ stop system should have cut in unless there is something very obviously wrong with it.
 
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