Inverter to non-inverter cct

[Jezz Brookes]

I've scoured my collection of circuits but couldn't find a circuit I'm after
but I've seen it somewhere. So naturally I turn to you guys for help
(again!)

I want a circuit that you can vary the gain from +1 to -1 (i.e. inverting)
and I came up with this circuit (attached). Is it going to work?

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