As many are aware, the third season of the show has taken an unexpected break. There have been no official comments regarding this, and so there are only rumours and speculation. Below are some of the possibilities as to why there is a break, and these have been from many forums on the line.
One possible reason for the hiatus could be due to the football world cup games, as several other scheduled TV shows have also been affected by this. This could result in a shorter-than-mid-season break (maybe five or six weeks) and then Episode 10 - Episode 13 could air, and then the mid-season break would take place.
Another possibility for the unexplained hiatus is to allow other the broadcast of the series to catch up to the position of the show in the UK, where the opening to each season and closure to the mid-season breaks haven't been consistent. However, this seems almost unheard of, and it is natural for a country owning a TV show to be ahead of other countries (The Big Bang Theory and The Game of Thrones are two prime examples).
Alternatively, the episode "Inferno" wasn't broadcast in the UK as it shared similarities to the Grenfell Tower incident, and was originally scheduled to be broadcast only a few months after the incident. Several unverified claims have been made that this episode will be included in broadcast syndication for Season 3, making Season 3 twenty-seven episodes, rather than the usual twenty-six, which could mean that Season three will have two breaks, i.e. a break now (nine episodes in) and a break between Episode 18 and Episode 19.
Speaking of this incident, The Grenfell Tower Inquiry is still in progress, and the next meeting is set for June 2018, and so it may be in the best interest to suspend the show for the meantime, as it may be frowned upon to broadcast a show which centres on fire, explosions, and people in grave danger needing urgent assistance at this time.
As stated at the outset of this post, there has been no official reason, and so everything above is pure speculation by users of the interwebs. However, it may be assumed that the mid-season break was planned to be between Episode 13 and Episode 14, as there have been several tweet-posts made regarding the music score to Episode 14.
Are there any more thoughts on this matter? Such as how a firm answer may be obtained. If anybody can positively confirm or deny what is going on, then, presumably, most that read this would be very grateful.