Both Downton Abbey and Manor of Speaking, the Houston Public Media TV8 show that dissects every twist and turn of the hit PBS series, come to a close Sunday night, with a two-hour series finale at 8 pm, followed by the last episode of Manor at 10 pm. At a recent taping of Manor’s final episode at the Melcher Center for Public Broadcasting on the University of Houston campus, there was laughter mixed with tears when the sign-off happened.