How is the uk postcode arranged

How is the uk postcode arranged?

1. Post Town (as opposed to the town you actually live in)
2. Area segment
3. Segment Sub Area
4. Sub Area Sub Area !

I forget the proper words

Other Answers:

Letters and numbers, it really works!!!!!

1)City/City Region-for London (1 or 2 letters)

e.g. SW for South West London
L for Liverpool
LS for Leeds

2) Area within your city (lower the number, generally the closer to the city centre) e.g. SW1 is Buckingham Palace Road

3) Then you get a number & 2 letters unique to your street. E.g. LS28 9NN is in Pudsey the 28th region of LS (Leeds). It is 28 & thus quite far from the city centre. 9NN is unique to the street of Milbank View and there are many street postcodes around it which start like LS28 9...

It's arranged in advance by the Post Office Pixies.

The anonymous poster is right. London postcodes were introduced in the 1850s and Glasgow was the next city to get them, in the 1920s.