Well, I live in the south east of England, and here's what I can see from my window right now.
We have had very little rain lately, and it's been pretty hot, much like the summer of 1940. The garden on the left sees a lot of activity (kids, not Spits) and is not watered, much like a grass airfield 70 years ago. Looks pretty yellow to me.
The garden on the right has no kids and is watered all the time.
I'm guessing the one on the left is more realistic for 1940 airfield grass. Did people water their gardens in 1940? No idea. Does someone know?
Oh ... not saying which is my garden!!
PPanPan