Just curious why they decided to label it London/Luton rather than Newport Pagnell/Luton!
Now that is a very good question.
Luton could drop the word London from its name as could Heathrow, Gatwick and Stansted and just call itself Luton Airport as most people know where it is and dropping the word Luton would not make any difference to its passenger figures.
Maybe what Southend Airport needs is a symbol or photo to be incorporated into its website, adverts and letter headings linking it to its location. Southend pier comes to mind or even a halibut.
Luton could use a Mosque complete with minarets but that would not go down well with El-Al.
No doubt the folk here could think of many other symbols Luton could use but let’s remember this is the Southend thread so would be off topic.