Ref the earlier comments........... "Don't just judge it on an idle power flypast and a very low power approach- remember it's empty. No people, seats, furnishings. Really just the bare weight of metal, 3 people and minimal fuel!"
The 'go around' at EMA was flown at TOGA (ie max thrust) and hence was as noisy as it ever gets, the approach I agree was flown at less than max power but still at representative levels. The second overflight of Derby (Sinfin) was again flown at TOGA power, set just prior to the pull up, turn and climb to depart to Hawarden. Plus the initial flypast was at reasonable levels of TPR, as was the initial fly through at Filton. In short, it is bloody quiet!