So, Chugalug, how do you come to know about it ? You must be psychic !.
No, simply jumping the gun again, Danny. Sorry! We were still speechless in the '60's, and I suspect that such a simple idea requiring nothing extra in tower or aircraft yet able to cope with a carrier wave transmission only endures to this day. If not, why not?
So back to the script, Danny, and over to you. Oh, sorry...beep!
PS, BTW the '50s link I posted for Ronaldsway was one of a series. The '40s one deals with its time as a Naval Air Station and mentions GCA:-
Ronaldsway Air Traffic Control in the 1940s