Maybe, but I drove them from 1980 to current
, and if "E" was as you say for injection on any Vx why was my Cavalier SRi not SRE, or the Carlton GSi not a GSE?? :-? :-?
The "i" is used universally on cars, including German models like VW, Mercedes, BMW to denote "injection", not "E" which believe me since the late 1960s/1970s,when I started driving, denoted "Executive" on non-injected cars, and as now the GLS, GTE, GL. GT, L, LX, E, etc, etc purely specified the cars trim level, for the sales reasons stated before, and had nothing to do with the engine specification.

You obviously hold to your understanding Jay, but I hold with mine that I have confirmed by going through the internet and checking various manufacturers, enthusiast, and general sites

If you can find a direct reference to "E" being for anything but "Executive" rather than for injection on any American, British or even European car I will be very interested.
8-) 8-) 
PS This is a great debate though Jay!

Sorry trimmed it down a bit as it was getting a bit big

In Europe the Cav SRi was an Ascona SR/E, as was the Kadett (Astra) and Corsa (Nova)
Mid to late 80's Vaux were starting the change model range, this was the time when the Cav Mk3 had just been released as the GSi, and the next model Astra Was being called Astra in Europe andf the Kadett name was being dropped.
the prelude to this was Vaux taking some of the sporty badges, this was also because there were a plethora of them on the market and this was Vauxhalls way of standing out from the crowd
Today these badges dont mean as much as they did 20 years ago when fuel injection was still new and was performance oriented, but as you will remember the marketing men were having a field day back then and to develop a badge that had the GTI qudos would have been a licence to print money, 10 years ago it was VVTi systems that were the subject of hupe, today its emmissions, and i bet someone will put a spec-level type badge to that soon.....
We have gone full circle with the E, today it does denote a higher spec, BMW have SE spec cars, and nearly everyone displays an injection car with an 'i' today, but back in the 80's, if it was a GT/E or GS/E then the E meant it was injected
I have a book here that was released to Vauxhall Employees, called 'The Griffin Story' in there it makes reference to it, internet wise i will have a looky as well, as i am sure i have read it somewhere.
As you said, interesting debate with differing views