Sorry it was worded in a wrong way.
I meant it as an example of a typical English putdown.
It is completely unrelated to what you said. The putdown being (as I perceive it) in the clash of "impeccable" with "north london", which is far from aristocratic an accent. If I am not mistaken, which I should not be - I went to YouTube and played a couple of videos with the said accent. No, not upper-class at all ;))))))

Just disregard this and read the second part of my reply ;))