Hate to be a party pooper here, but there's a few mentioned that I'd be wary off
Ginger is from the root, so not allowed.
Fennel is from the seed, so again not allowed.
Eucalyptus, though from the leaf has the possibility of having some of the oils in it (not 100% sure on this one though).
Having said that, some people don't seem to have a problem with them.
Don't forget you can have Redbush and also if you want a fruity tea, you can add some berry water flavourings. I've heard it's lovely in green tea :clap: