All non-profit (and some for-profit) institutions populated by the educated. Media, broadcasting, TV (not just news but everything), radio, the BBC, the creative arts, teaching, schools in general, academia, the civil service, the NHS (but only the educated side of it - nothing for cleaners and cooks, unless they fall into an identity group, which fortunately they usually do). Basically anything that requires credentials, be they educationally or identity based. The modern Labour party exists for these people.
The big shift in 20th century and beyond has been that once, the Tories would have covered many areas of the above list whereas Labour represented the working class of any description. That has changed a lot and has left a lot of the poor unrepresented. It is no longer enough to be poor - you now also have to have the right opinions and ideally be 'diverse' before Labour are interested in you.