...and now it's occured to me that the old Honor Oak Baptist Church is on the corner of Mundania Road with a SE22 postcode which might be thought to scupper the postcode theory. (Maybe there was an Honor Oak parish? And maybe our sense of where neighbourhoods begin and end is sometimes influenced by old parish boundaries?) And aren't bits of the Honor Oak Estate in SE4?

I suppose that reinforces what Michael's suggesting. There's an official verdict on where the boundary is between Southwark and Lewisham - so you can't choose where to pay your council tax. But below that level the boundaries of neighbourhoods aren't formalised, and they've probably wobbled around over the decades. In the end it's down to common usage.

It'd be interesting to hear from:

* Anyone from outside SE23 who feels that they're a resident of Honor Oak.

* Any local historians with ideas about where these neighbourhood boundaries came from originally.