sex - duplicate in supplement file
-8 = missing
1 = Man
2 = Woman

age - duplicate in supplement file
-8 = missing
-7 = not asked
80 = 80 or older

original education labelled
-8 = missing
-7 = not asked
0 = child in school
1 = no qualifications, adult
2 = CSE, not 1 England & Wales
3 = O-Level, CSE, SCM
4 = GCSE A-Level
5 = SCE-O or lowers Scotland
6 = other non-significant qualification
7 = Scottish Higher
8 = certificate of 6th year of study
9 = City & Guilds
10 = ONC, OND, SNC, SND
11 = Scottish Vec national certificate
12 = Scottish BEC TEC cert CD
13 = clerical or commercial qualification
14 = apprenticeship
15 = significant other qualification
16 = HNC, HND, SHNC, SHND
17 = professional qualification, no exam
18 = teaching degree
19 = nursing degree
20 = university certificate or diploma
21 = university degree

age left formal schooling
-9 = not possible to create
-8 = missing
0 = still in school
15 = 15 or less
21 = 21 or older

ethnicity
-9 = not possible to create
-8 = missing
-7 = not asked
1 = white
2 = black
3 = Indian/Pakistani/Bangladeshi
4 = other and mixed race

country / English region
-8 = missing
1 = North of England
2 = English Midlands
3 = East of England
4 = London and South East
5 = South & West of England
6 = Wales
7 = Scotland
8 = Northern Ireland