NavList:

Bill Ritchie you wrote:  Nice cryptic clue, David. Google Earth Pro V7.3.4.8248 (64-bit) shows the mast, perhaps under construction as the vehicles surrounding it are not in your photo.

Bill
I think you must be looking at a tower slightly south of my one.  My tower doesn't appear on Google Earth either.  I think you must be looking at the one on the NE corner of the former WW1 aircraft factory and Acceptance Park.  They also repaired Lancasters there in WW2 and built the five Baby Vulcans there from the late 40s https://en.wikipedia.org/wiki/Avro_707 .  Apparently they would close the main road and tow the repaired Lancasters down the road to take off from a well known air station just to the south.  I'm afraid that in searching for your suggestion, several uninvited programmes seem to have invited themselves onto my PC including something with a big red O that took over as my browser.  I'm gradually getting rid of them, but not being up with all the buzz words and phrases and being unable to remember what was on to begin with, I'm only half sure what I'm doing.  DaveP