to June 2011. Series conclusion In August 2011, Kudos announced that the tenth series of Spooks would be the final series. Executive producer Jane Featherstone decided to end the series during its writing stage, stating "It's very tempting to keep going, and we have had ongoing conversations with our partners at the BBC about it, but the heart of the show has become those two characters [Harry and Ruth] and I feel they own it. We've followed the arc of their personal story and I think they've brought us to a natural end, which you will all see played out later this year." It was also intended to end the series "in its prime." Writers Brackley and Vincent noted "there was always a strong possibility of it being the end, so throughout the [writing] process we were looking for ways to infuse it with a sense of finality. We'd done a fair bit of writing before it was made definite by Kudos – but had plenty of time to plot a true conclusion. And crucially, by the time we began to write the final ep, we knew it would be the last." They also stated; "When Kudos asked for our opinion, we said we'd hate to see it cancelled on a cliffhanger – it just wouldn't be right, or fair on the fans. Call us suck-ups, but you have to really admire Kudos for having the confidence to kill off a very successful show – purely because it's the right thing creatively." Firth believed the series is getting to a point where the producers were starting to run out of story ideas, as virtually every type of antagonists have been featured in past episodes. Broadcast and reception Trailers A number of trailers were produced before the broadcast of the tenth series. A first look trailer was first released in July 2011 on the BBC, which also consists clips from other BBC programmes including The Body Farm, Doctor Who, The Hour, Merlin and Page Eight. In early September a short teaser trailer was released, which includes clips of the series with the tagline "This is the end." This was followed by a full 30-second trailer a week later. Broadcast and ratings The tenth series began broadcast on Sunday, 18 September 2011, during the 9 pm to 10 pm timeslot, on BBC One. It was considered a move as previous series were