According to this article
ITV drama Downton Abbey is being filmed at Alnwick Castle - The Journal
is Downton filming in Alnwick Castle until August 8th!
So, as we predicted, in the CS the family will again be away from Downton. But where? Who might live in this castle? It's the second largest lived in Castle in England (after Windsor). It is really huge!
I doubt it can't be Tony Gillingham's house? Or Lord Merton's? It seems too large for both. And I also doubt it is Charles Blake's house, since the man himself is not able to film there due to his theater obligations.