Being Human 3.05

Before I start babbling about the episode, help me out, flist, where could I know Nicola Walker from, who played Wendy the social worker? Because I'm sure I've seen and heard her before. The voice especially rang a bell, but I can't place it, and that frustrates me to no end because I feel I should know.

ETA: and altariel came through! It's Ruth! Ruth from Spooks! I can't believe my memory withheld this bit from me!

( On to the episode! )