I am using the exam document class and have a few questions about customising the layout. Firstly I want to move the question number to the left so it is in line with the left header, and I want more horizontal space between the question number and the actual text of the question. I'd like to do the same with the question part numbers too, having it aligned with the left part of text of the question above, and left justified instead of right justified.
My explanation was a bit rubbish, so here's a pic to illustrate something like what I am after (I want the left, instead of the right):

MWE:
\documentclass[a4paper]{exam} \renewcommand{\thepartno}{\roman{partno}} \begin{document} \firstpageheader{\large\textbf{Pure Mathematics: Number theory}}{}{\thepage} \runningheader{}{}{\thepage} \vspace*{0cm} \begin{questions} \question For positive integers $a$, $b$ and $c$ \ldots \begin{parts} \part For positive integers $a$, $b$ and $c$ \ldots \part For positive integers $\alpha$, $\beta$ and $\gamma$ \ldots \end{parts} \end{questions} \end{document} 
\renewcommand{\questionlabel}{\thequestion.\hfill}will align the question numbers to the left. Not sure about the parts, though.