Perhaps they should be entering them all as they were before local government reorganisation in 1974 - County councils with the Rural and Urban district councils that came under them and not forgetting London indexed as it was as LCC before the GLC was formed in 1965. 
The problem is then where do you draw the line? Lots of places are historically not part of their 1973 counties.
For example London was a county of its own from 1889 until 1965.
Until 1844 Lindisfarne was part of County Durham, so that is where you'll find it in the 1841 census.