Keeley Hawes did a fabulous interview and photo spread with the Evening Standard Magazine 29 August 2008 edition.
Some comments include that Keeley is happy with three children, although Matthew Macfadyen would say "Oh you never know...."
"She is all pride and no envy when it comes to Matthew's success..."
You can read and view the online version here.
(thank you JaneV and 6point7)