SERIES FINALE: This charming series is a spiritual sibling of Curb Your Enthusiasm, so it’s almost unfair that it ends up being scheduled directly opposite Larry David’s groundbreaking predecessor.  Episodes began with a British husband-and-wife writing team, played by Stephen Mangan and Tamsin Greig, being pulled reluctantly into the orbit of Matt LeBlanc, who had been selected to star in an American TV remake of their acclaimed British series. It ends, all these years later, with the writing couple still in Los Angeles, and finally extricating themselves from LeBlanc. Or have they? And, in any case, what next? Episodes has been so clever for so long: How will it say goodbye?