I've just watched this last night, as I couldn't catch it in "real time" - quite interesting, as someone else has said, the "Eastenders" tag put me off - then I realised she was an actor I'd seen in "Vera". It got better, in my view, as it did go further back through the generations.
Don't really feel the series has "lost its way" - but I think many of us have spotted minor errors here and there, or things we thought were worth following up that were not followed up in the programmes, - after all, their researchers haven't got the magnificent mob of Rootschatters on hand to help them out - or have they??