Which tea factory tour is actually authentic not just a gift shop

Honest answer from inside the industry: go on a WEEKDAY morning when the factories are actually processing the previous afternoons leaves. On Sundays and full-moon Poya days, many factories do not process and the tour is just a walk through silent machinery. For more authentic tours: Dambatenne (the original Lipton estate near Haputale, with the climb up to "Liptons Seat" lookout above the tea fields) gives an excellent working factory tour and is far less coachloaded than the Nuwara Eliya ones. Mackwoods (Labookellie) is busier and more polished but still shows real processing. Pedro Estate is also working. Avoid Sunday visits, ask before you go in if processing is running, and tip the guide if it was a real tour.