I Found this movie rather unsatisfying. The role of the doctor, (John Thaw) and his wife (Sorcha Cusack) and the mistress, (Frances Barber) were all extremely well played and but were rather two-dimensional as people, and the in the end, the mess made and the lives of all three negatively affected was the way such stories go. So why was it so "been there, done that?" Even the sub-plot, the dropped-out son and the street couple didn't have much credibility.
Perhaps they were so married to their respective roles that the humanity was compromised. Doctor, psychiatrist, housewife were defining roles, and at the end, we have a fallen-from-grace doctor, an sacrificial-lamb psychiatrist and injured housewife, but all the ins and outs of the story don't seem to have changed them much. This film runs more on symbolism than personal growth, and as such it lacked warmth and humanity. But it was a good story of a particular type, well told and superbly acted.