Not sure if this is the same one you are thinking off but early in the 70s there was a series about a vicar who had to advertise for a congregation his wife did *extra* services and if I remember correctly the son was doing business studies at school not common in those days It was a dark comedy but unfortunately we could not remember the name. My late husband thought it had Titantic somewhere in the name and I had at one time put a query out her on Answerbank to no avail and I also goggled old shows on TV in the 1970s Thought at one time we were imagining it. Would be interested to know if its the same as you are thinking about. Sorry couldn,t help with title