SE1: why this London postcode has the number 1

SE1 is the number 1 of the South Eastern district: the streets served from the district office itself. The alphabet begins at SE2 with Abbey Wood.
See SE1 on the map
SE1 is the number 1 of the South Eastern district: the streets served from the district office itself. The alphabet begins at SE2 with Abbey Wood.
See SE1 on the map