Bergamot seems to be the active ingredients in Earl Grey tea and all the studies are animal studies as you rightly point out.
I can find no scientific studies in man.
It is likely that you would have to drink gallons of the stuff to have any effect on your cholesterol levels.
Statins seem to be the answer at the moment to lower cholesterol but if, for any reason , you get unacceptable side effects, then Ezetrol tablets are a satisfactory replacement.
You may have got a more varied reply from AB if you had inserted your question in Body and Soul.