Opposition members have understandably questioned whether Liberal Democrat city councillor Sue Roaf will still be able to represent her constituents having taken up a new job in Edinburgh.

Ms Roaf says she will resign, but not until the next elections in May. In the meantime, she intends to spend half her week in Edinburgh and half in Oxford.

We have a more fundamental question for the councillor who has consistently championed environmental issues, including being the first person in this country to live in an eco-house - just what impact will commuting between Edinburgh and Oxford every week have on her carbon footprint?