A crime drama, possibly on Ch4 or Ch5 where the female police detective is marriedto a failed black artist. The wife's dad was also a copper and disapproves of the husband. The couple have a son who is quite close to a family friend. This friend later proves to be mixed up in drug dealing and murder. Not sure if there was a boxing club involved? The couple are always arguing and decide to separate. The husband finally sells a painting. Any ideas?