A friend of Mrs BD has tipped us off about this too, we'll give it a go...
Just finished the series, binged over 3 nights. Certainly worth a watch. Thanks for the tip. Won't give anything away other than to say well acted IMHO, even the kids which is oft not the case. Lots I could comment on, but not without spoiling it. I'll keep quiet.
Richard Armitage is also in all 3 series of one of my favourite dramas, 'Berlin Station', originally shown on C4, now available on All 4 I think, and possibly Amazon Prime or Netflix.