I have been asked for help in finding most recent income levels and related postal codes. Also, separately, can I look up education levels and postal codes in same city?
They can find Income and Education data in the 2011 NHS profile here (they just need to type in the search):
For postal codes, they would need to contact the closes regional office for custom data request.
As well, the following may be of use/interest:
We have the census profile at the postal code level. The profile includes characteristics such as population, age, sex, dwellings, families, marital status and language.
We also have NHS Profile.
Data products, 2011