I think you have to remember that scenes like this have a degree of reality because one of the actors is leaving the show in real-life. As I understand that Simon Gregson (Steve) is off for an extended leave of a good few months, this obviously applies here.
Having worked so closely together in the drama, I'm prepared to believe that the pair of them showed their real emotions in the episode and I don't find anything wrong with that.
I don't agree that it was cringe making. They are obviously very good friends and as MT says, they are obviously very good friends and have worked together for 10 years.