I find the amount of plastic in tea bags and even now these popular coffee machine pods very concerning. But it doesn't seem to stop companies from making a viable business with people willing to drink up convenience!
I used to like 759's large, cheap, large box of Ceylon tea (box has yellow and white stripes). Give it a try sometime. If you like it strong, can use two bags. Very cheap.
It's a bit silly to pay big bucks for British branded tea while living in Hong Kong.
To be honest, it's the cheap brands that I'd be more worried about regarding plastic. Maybe it's unfounded bias, but I think I can trust European brands more.
Just opened up a box of M&S Luxury gold. It's fine, though I'm not sure there's much difference from just Everyday, Gold or Twinings. Except for the round tea bag vs the square.