Lady Adelaide Midwinter, played by Olivia Grant, last appeared in episode 1.10, Episode #1.10 (2008).
Sir Timothy's address is 46 Montague Square, Mayfair, London.
The book Sidney is reading aloud from is one of the Bevis book series by Richard Jeffries in 1882.
Brendan Coyle's marked absence from this show was likely due to him starting work on Downton Abbey around the same time in 2010.