have to say I now possess almost no glass at all - over a period of several years it almost all went back to the charity shops - my take on re-cycling

Collecting becomes simply possession in the end, and having filled several garden sheds and with glass in almost every room in the house, something had to give, and I consider that I probably learned about as much as my brain can accommodate. I might have sold it but probably not prepared for the hassle involved.
As to the question 'where are all the repro pieces' - my opinion is that there are a lot of collectors who own glass which they consider to be older than it actually is ............... you only have to look at the sales pitch being made on ebay and related sites to see that there are a lot of private dealers selling glass that isn't as described.
The word Georgian appears to be used for much that isn't from that period. Expression such as "could be Georgian or Victorian - you make up your own mind", was one that I thought was comical, but not the sort of phrase that should have a legitimate place in the world of glass selling. Ultimately, with the type of glass we're speaking of, and if we want to be precise and truthful, then it's obvious that without a label and/or backstamp, then the accuracy with which we describe such pieces comes down to our experience and knowledge, and there are a lot of people who lack both. Just to repeat again, it's probably unrealistic to expect reliable comments for 'difficult' glass based on screen images only. I hope you have been lucky with this piece, but for your success there might be a dozen others who will buy based on simple criteria and find their fingers burned.
It's disappointing to visit antiques centres - or at least those near me - and see the sort of glass being palmed off as antique when obviously it's not.