This was an enormously enjoyable production and has something for everyone. The acting was superb, especially from the children. My only complaint is the size of the plot holes. Having introduced an interesting idea from mainstream science the writers seemed to forget the need for consistency with the idea in the narrative. Most of these loose ends and inconsistencies showed up in the final chapter. For pedants such as myself, the resulting plot holes took something of the shine off this otherwise excellent series. Finally, it is pleasing that we have a series here that has an actual end in sight, although the producers seemed to have left a chink open for a second series.