Well Jem,
When I heard about it I must admit I was most dubious,weren't we all?
However,I thought it was very well done,and that having Jean Marsh there enabled us to have just enough of a link to the old series.
I do think that maybe they could have made 6 episodes,3 as shown and 3 more over the New Year Holiday.
Of course it was left quite open ended,and being 1936 all the trials of WW2 would have been soon upon them.
I (sadly) don't think we WILL see any more as the BBC doesn't seem to have the will(or the money) for big drama series any more.
We can sit and hope though can't we?