premise: Holding the Fort is an ITV situation comedy starring Peter Davison, Patricia Hodge and Matthew Kelly. It was an early product of the writing team of Laurence Marks and Maurice Gran. Three series were recorded, a total of twenty episodes, first aired between 1980 and 1982, concurrent with Davison also starring in "Doctor Who". It was made for the ITV network by LWT
hypothesis: Doctor Who aired between 1980 and 1982.
reason: While it ran concurrent to Holding the Fort, it is possible that Doctor Who did not run specifically for those two years and that it only ran concurrent to Holding the Fort for a portion of those years.