There was a time when you knew where you were with Silent Witness.
Corpses (or component parts thereof) would stack up in the mortuary to await the attention of Amanda Burton, who would sigh and gaze mistily into the distance before plunging her scalpel into a prosthetic liver.
She would then slice off a bit, sigh and gaze mistily into the microscope before pronouncing upon the cause of death, which was never as straightforward as you thought because they had an hour of BBC drama time to fill after all.
In fact, if Amanda began by delving into the cerebral cortex, you knew the blame would eventually be attributed to a ruptured spleen or something similar because we were always taken on a guided tour of the innards before the credits began to roll.
But, after 16 blood-soaked years, we appear to have a sad case of professional suicide on our hands.
When the series eventually expires, the post-mortem will be quick and the inquest verdict quite straightforward.
Death will be attributed to sclerosis of the scripts, a bloated sense of self-importance and mass myocardial infarction within the production team.
Put simply, nobody’s heart was in it any more.
Which leads me to make yet another plea for television producers in this country to cast their gaze across the Atlantic and learn once and for all how successful drama series should be made.
In the past 25 years we haven’t produced anything which compares, even remotely, to the sustained quality and class of shows like The Sopranos, The West Wing or Boardwalk Empire.
Then, just when you think the Americans cannot possibly surpass themselves, along comes the ineffable Homeland.
It does, ironically, feature a number of British stars, but the concept and slick execution is indisputably American.
There was an audible groan in our house when the current series came to an end, followed by an unseemly rush to order a copy of the box-set.
It really is that good – meanwhile I suppose we must brace ourselves for more lumpy, home-baked fare like Trial and Retribution and Above Suspicion.