Thank you to everybody who has replied to the post so far and apologies for not posting pictures, quite daft actually because as they say, a picture can say a thousand words.
Focusing on the marks was rather hard as the camera refused to focus on them properly but hopefully you can make them out (anybody know how to use an iPhone camera properly?). The long marks were caused by seed pods that came off the trees and the circular mark was either leaves or bird droppings (I forget which).
