Does anybody know what the difference between profiles in the air con is if you have it on profile high will the air be colder than on low profile thanks

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Believe its a combination of fan speed and how hard the compressor works to cool/warm the air depending on the heat setting.

Almost certainly in light mode you'll find the air doesnt come out as cold as it does in strong but guess it impacts on engine performance/efficiency the harder the compressor is forced to work.

That is my understanding as well, it affects the fan speed and how much the compressor runs.

As above

the impact of which is not the final temperature in the car, but the speed at which that temperature is reached.

Yep - think of it as the 'aggressiveness' of the auto setting