@Steve:
You are absolutely correct, I shot at 24fps and I set the shutter to 1/30 to get more light into the shoot and the way u explain it that causes noise I reckon.
I will re-shoot the sequence with 1/50 as the shutter speed and see what happens, you know the funny thing is that all these low light videos shot by 550D look amazing on youtube when posted by other people but when u actually get down to doing it yourself it doesn’t quite come out the way you want it to.. :-sigh !