BBC Press release for Human Nature

The BBC Press Office have released details of the Doctor Who episode, Human Nature, they say:
It's 1913 in England, and an ordinary schoolteacher called John Smith dreams of adventures in time and space and a mysterious blue box, as Russell T Davies's Doctor Who continues. But, when lights in the sky herald the arrival of something strange and terrible, Smith's maid, Martha, has to convince him that he alone can save the world.

and more information:

War has come a year in advance as the terrifying Family hunt for the Doctor. But, while John Smith refuses to accept his destiny as a Time Lord, the women in his life, Martha and Joan, have to take terrible measures to save the whole of history.

Jessica Stevenson and Thomas Sangster guest star.