Thanks, I suppose it could be some fluff. I could ask them at the MOT.
Airline might be excessive...try either a Photographers hand bellows (for blowing dust from lenses) or a tin of Air Cleaner (again used for cleaning keyboards, cameras et al)Interesting that you should mention that as I have a quiet humming from the same area. Ive seen previous threads regarding noise from this area and it has led to all manor of hypothosis including a mention of the "final heater resistor" which would seem a popular one as they seem to sell quite a few on flea bay.
Q for Saint V8 How would you suggest removing said fluff? Is a blast from a air line/gun down the vents sufficient to dislodge or is there some dismanteling to be done?