I have to admit an inappropriate smile and a curiosity about a particular road quite close (about 8km) to SHADO HQ. The road came well after UFO, so not much chance of an influence on the script writers. The road I'm referring to is Lieutenant Ellis Way in Cheshunt.
The real history of the road can be found here:
https://www.hertsmemories.org.uk/content/herts-history/places/monuments-and-memorials/lieutenant-john-d-ellisBut in my head, there's only one Lieutenant Ellis.