Hi
I use a Nikon D80 and noticed some marks on a batch of pictures I took, I cleaned my lens [bigma] and thought no more, the last lot of pictures I took had the same marks

There is a sort of crescent top right and two dots opposite on the left, today I fitted another lens to the camera and took a couple of sky shots and the marks are still present.

What do I do next, is it back to the shop and if so which one [I live in Chatham Kent], I bought the camera from Curry's and wouldn't trust them with it.
Advice greatly appreciated.
Brian.