Thanks for the replies.
With regards to the grain in the first: I am fully aware of it, and am making no attempt to hide or remove it. It was a quick snap at ISO 1600, hand-held from the car, and it resulted in a gritty urban shot. I like it that way, so kept it. Thanks for the complement on composition Easy Target - it's quite an unusual image for me, a departure from my usual style in terms of more traditional comp.