A rough timeline.....
Model 912 1949- Approx 1968 Headlight, 2 position height control,old style rubber handle grip, metal brush inserts. 3 core earthed/grounded.
912A Approx 1968-Approx 1977 Headlight, 3 position height control, new plastic handle grip/switch plate, nylon brush inserts.Early machines earthed late machines double insulated.
U7008 Approx 1977-Approx 1988 Blanking plate over Headlight, fully shrouded furniture guard, 3 position height control all double insulated.
All the above have shake out bags as standard.
C1312 Possibly only 1989???. As U7008 but revised beige/brown body and Conquest bag setup. As ive said im not aware of any other UK collector actually owning one!!!
Seamus