Pretty sure it's a County Council issue.
Oxford City Council merely maintain the roads within the city on behalf of the County Council, unless it's changed since I worked there. Having said that, what are they supposed to do if the works won't be finished, in which case it's Network Rail we should be after. Interestingly, the city boundary doesn't go out as far as Botley. I actually think we should extend the city boundary northwards to incorporate the second largest village in England (to quote KPC, despite it not being true!), which would keep our new stadium within the city limits.
I love the County Council regardless after yesterday!