Thanks guys, it's the first time I've weathered a racing car, I only normally do that with my Rally Car builds. In this case though it covers up the poor panel joins as the bottom half of the doors are seperate pieces.
The tyre rub was just a tyre from my spares box with the sidewall painted matt black and rubbed down the body side.
We had a few of these racing at Silverstone Circuit about 5 miles from here, over the weekend, and I very pleased to say that the weather was superb. It's the best Classic racing event they hold there each year and in my mind surpasses thier F1 weekend.
It's amazing to note that the cars ages are from the 1920's of even earlier and most of the owners have had them since new!