completed feature-request
Sometimes, I regret pushing the "answer" button, and rather want to go back to the question. Since the original question is shown on the left, its title could conveniently be a link back to it.
Top Answer
James Douglas
We have added a link in the header that points back to the question:


And the question title on the left (or on the top) is also a link as well:

Answer #2
How about an explicit "cancel" button (for writing questions, answers and edits)? It could be located besides the `post answer/question` or `update post` button. 
Add "return-to-question" link
@James Nice. Maybe for consistency also add a "return to posts" when viewing a post?
@samcarter That'd work too.