A failing inlet manifold gasket wouldn't leak coolant into the exhaust - it would leak externally, causing wet spots and/or crystal build-up on the back of the engine or it would leak internally, allowing coolant into the cylinders, resulting in lumpy running.
What's your coolant level like?
Blue smoke would usually indicate oil is being burnt.
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Rover 75 1.8T Contemporary SE Auto
Starlight Silver MBB
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