When a Dracorex came through an Anomaly to the Medieval London town, the locals sheltered in the church sent de Mornay to stop the creature, and he pursued it through another Anomaly to the Present. He eventually returned to Medieval London, where he was hailed as a hero for vanquishing the creature, and would eventually go on to marry Elizabeth. (Episode 3.7)
In 1840, Lady Emily Merchant was born in London. (Episode 4.3) It is unknown if she was still living there in 1867, when she got married and became stranded on the other side of an Anomaly. (Episode 4.7)
In 1868, Matt Anderson travelled from the present day to London in that time period to find a Raptor responsible for gruesome deaths in 1868 London. Matt and Emily Merchant (who had previously returned to Victorian London in 1867) successfully captured the Raptor and escaped with it back through an Anomaly to the Present. (Episode 5.3)
In an alternate timeline where New Dawn's effects on Earth reduced the surface of the planet to a sterile wasteland, London was left ruined and badly damaged. (Episode 5.1)