I like it, looks good. Would be interesting to see them both from a standing start, The Leon cupra 280 has been swift in the reviews I've read so bodes well for the Clubsport.
I had this rear near side knocking. It was a misaligned exhaust hanger. The dealer had the car for the day and it had now been fine for the last couple of months.
VW7R you must have been lucky, I had bird poo on my roof for only an afternoon, a matter of 3 hours max. It was removed when I went out to the car. Unfortunately, it did mark the paint.
The article below suggests that it is not the bird dropping acidity.
http://www.autoglym.com/news_articles/new-research-dispels-myth-of-why-bird-droppings-damage-paint