Orchis Fatalis is a pretty good episode, it's not entirely memorable, nothing particularly stands out, but it is a decent watch. I like the story, and I get the mania that the characters have for rare orchids.
Dan cements his place as possibly Barnaby's most irritating colleague, cocky, overbearing, even willing to tease poor Cully to get what he wants.
Matt Bardock is good, Harriet Walter is very good, although she would be better served in a future episode, Death and the Divas.
The opening scenes look pretty good, although clearly not set far afield, a decent attempt is made to look the jungle look real. It ends pretty well, with a fairly dramatic conclusion.
Decent watch, nothing memorable. 7/10