Since the Comet 1 preceded all other British and French built Jets of the era, thats the starting point, say early 50's but probably on the drawing board in the late 40's.
I may be wrong but I believe there is a Caravelle still flying in Africa. Or, to put it correctly, was flying last year but still probably capable of flight even though its currently parked. So the 112volt era is probably not quite dead yet.
The ex RAF Britainnia parked at Kemble is live and can taxi and is 28/112v GPU supported. There is a Comet 4 at Bruntingthorpe but whether that is live and can taxi I dont know.
In respect of design, the advent of 400Hz and the control of it did for 112 volt sysems in terms of weight, system compexity and design and build of electrical components.
As to putting it back? Unless there is a return to at least electrically operated landing gear (the Valient Bomber of the 50's), flaps and powered nose wheel steering (to dispense with tow tractors), then its difficult to see a major electrical system redesign to justify it all. But then who would have thought you could build a high content 'plastic' passenger aircraft even 10 years ago! Okay, someone was thinking about it but it wasn't me!