Who is the actress who plays wife on Strike Back?

You're likely thinking of Michelle Lukes, who plays the role of "Rebecca", the wife of "Sergeant Michael Stonebridge" (played by Philip Winchester), in the British action series "Strike Back".

She appears in the first two seasons of the show. However, it's important to note that she's not the only woman to play the role of "Stonebridge's wife." In the later seasons, when Winchester's character is re-introduced, his wife is portrayed by a different actress, Eleanor Matsuura, who plays the role of "Natalie".