Until the mid-1990ies, the middle class (ABC1) vote oscillated around the 55% mark, with a peak of 59% in the 1979 election, if ipsos.com can be trusted.
Yes, that’s the percentage of one, and not the largest, demographic group, and must be seen in context with the absolute numbers.
I also agree that Thatcher wouldn’t have made PM without appealing to the C2 and DE demographic.
