There are SW (south west) postcodes, SE (south east), postcodes, NW (north west) ones but no NE one for north east London. That is because NE is the postcode for Newcastle.
Likewise, there are N, E and W London postcodes (north, east and west) but no S postcode, because that is used for Sheffield.
Another quirk, designed to confuse the unwary, is that the numbering of London postcodes is alphabetical, not geographical. So a postcode area 3 is not necessarily next to 2 and 4…
However, I am more interested in sex.
So, we have or had Middlesex (the central area), Wessex (ie West Sex), Sussex (South Sex), Essex (East Sex) but no North Sex, presumably because the people of Nosex eventually died out.
Apparently, in this context, ‘sex’ turns out to be an abbreviation and corruption of ‘Saxon’, which is a disappointment.
But life is full of disappointments.
I am going to have breakfast now.