LHR inbounds will rarely be at minimum approach speed when they pass the area around LCY and the vast majority of aircraft will have their gear still up then as well which generates less drag and needs less power. They are at a fairly quiet phase of flight really.
Even if one does find that they are more noticeable than LCY traffic, I would have to admit that you would be hard pushed to put the noise into the category of disturbing! Drive along to Hatton Cross to experience that!
