Lord Chamberlain's readers or controllers, which were a handful of people working directly to him, were a very assorted group of people and some of them tried very hard to be as liberal as they could.
The foyers now look ridiculously small to us because not all that many people used them.
Suddenly we saw that you could do plays about real life, and people had been doing them for some time, but they weren't always getting to the audiences. They were performed in little, tiny, theatres.
There were loads of plays which were very popular before and after the war, where everybody wore a dinner jacket in the third act and it was in a house that you wished you'd owned with people that you wish you knew. It was life seen through a very privileged way.
When you're writing about people that are not very well off, you seem to see the kitchen sink. So it was a bit of a sort of cosy phrase that got used a bit too much.