I watched an episode of the above a few weeks ago and I thought it was the first episode of the new series - a two parter. It was the episode which started with the team on their holidays and they each received a strange item in the post.
It hasnt been on 5 since then so I suspect it was the last episode of the series instead of the first
You have either seen the last episode of series one or the first episode of series two which concluded the two parter.The second series has just started on Living