Can you help solve these Coronation Street mysteries?

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There's a few things I'm not sure about at the moment on Coronation Street.  Can you can help solve these Corrie conundrums?

Number one: Who is the chef at Nick's Bistro and why have we never seen them?

Number two: What's happened to Dev's kebab shop? Who's working there now and why is it never mentioned?

Number three: Where have the Renshaw twins gone?

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