Thanks @sirex & @KrakenPeppers for the informative replies. Sorry for coming back late, I seem to be unable to stop notifications going into my spam. This is very interesting.
>>Everything is a hybrid.
I think I am making a common mistake and using the term "Hybrid" too loosely. What I ultimately want to know is if a plant grows well for me/I like it, that I can harvest the seeds and grow an identical plant from them. I have an Apache "F1" but I understand that because this is a "hybrid", if I grow it's seeds, they may turn out to be either of the Apache's parents rather than another Apache. Pardon my naivety here!
Is there a way for me to know which of the varieties I'm growing will produce seeds which produce the same plant (when seeds have come from reputable source originally)?
>>I rate this seller at 25% and that's because he's quick to post and the seed arrives in good condition
I am basically having the exact experience you describe with that seller. I ordered the "Black Devil" from them, they arrived quickly (to the UK from Aus!) and all 4 of the first batch I sowed have germinated in 8-9 days. I am not too concerned how those turn out, as long as they are nice plants. I did however also order some Buena Mulata from them (sowed 5 days ago), which I really want to ensure are genuine. I also got some BM seeds from a more reputable seller (
http://www.semillas.de ) which arrived today so will have to sow a batch from those, label carefully and monitor differences.
Thanks both for any advice you can give.