I'm watching Smiley's People, having snaffled it from Iplayer some time ago. Looking at the cast list and then delving into wikipedia I learnt that Molly Meakin (head of Research, replaced Connie Sachs) is played by a woman called Lucy Fleming. Her uncle was Ian Fleming, author of Chitty Chitty Bang Bang the James Bond books and she (and her sister) still control Ian Fleming Publications. The link between the two contrasting types of spy, Bond and Smiley, tickled me.
(She also played Miranda, Justin Elliot's wife in The Archers.)