Where was “Walker” ?
Looks like it is a neighborhood in Newcastle Upon Tyne. Which makes sense, since that’s where they were from, and probably in / around London when they were writing/performing it.
I have been trying to trying to deduce that myself
Since this single was released under a different title in the USA than Britain -as “Georgia”- I looked at that map and did find a Walker County in GA, and ‘the big city’ would be Atlanta, then... which is ‘to the south’ of Walker, per the lyrics
That’s the best I can figure, fwiw