Elinor Dean becomes a subject of great interest to the agency when one of their surveillance targets, known as SB, is seen frequenting her home in Stoke Newington.¹ 

Described as a plump blonde² (and by Hutchins as a bit “mumsy-looking”³), Elinor Dean is observed patting SB on the head⁴ and making a few interesting purchases from Tesco⁵ and a B&Q.⁶

^{1, 2: Troubled Blood, Chapters 25
3: Troubled Blood, Chapter 39
4: Troubled Blood, Chapter 25
5: Troubled Blood, Chapter 32
6: Troubled Blood, Chapter 55}