Apparently the series is to air in two five-episode blocks, rather than continuously.
If the last series is anything to go by, that means the final programme of the series will be shown sometime in 2018, having been delayed by a football match between two non-UK countries, a snooker tournament, a specially extended edition of EastEnders to mark their 10,000th on-screen disaster, and urgent re-runs of some celebrity chef's Christmas Cooking series.