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the only other time i have used redex on a car not in the fuel tank was on my old 2 litre capri, where i basically poured some in the carb with the car running. vast plooms of smoke ensued and it seemed to make a difference.

would i see any benefits from getting my 2.2 petrol running and squirting some redex (or similar) in the throttle body?

Carb and throttle body aren't the same thing.

The carburettor was where the fuel/air mixture was formed before going to the combustion chamber.

The throttle body appears only on fuel-injected cars, and so only does the job of controlling the amount of air going to the combustion chamber - the fuel injector, along with the engine ECU, does the job of controlling the amount of fuel. The injector also mists the fuel as it is injected, providing the fuel/air mix needed for combustion.

Because the throttle body isn't used for delivering fuel into the engine, I wouldn't recommend putting any combustible substance in there.

Is there a specific problem you're trying to solve? Down on power, or rough idling?

Mine was idling strangely; running anywhere between 700 RPM and 1800 RPM. I had been advised to clean out the throttle body, as it might be the butterfly valve sticking. However, I chickened out and took it to a garage. They took the throttle body off to inspect it and soak it in a cleaning solution, but noticed that the throttle body was fine, and in fact seemed to be pretty new. What wasn't fine was the gasket between the throttle body and the intake manifold, which had perished and crumbled away completely in one corner, meaning that the amount of air getting into the engine was uncontrolled. They replaced the gasket and the rough idling issue is gone.