Segreti mortali
The Poison Tree (original)
Starring Hebe Johnson, Neil McKinven, Lex Shrapnel, Patrick Baladi, Naomi Bentley, Helena Pardey-Yaralli, Ralph Brown, Sean Francis, Nathalie Cox, Joanna Hole
It's a drama and mini-series show, and has a rating of 5.7 out of 10 from Imdb which is fairly okay for this kind of show.
Watch it here
Not found streaming from Italy.