The opening titles music is part of Val Bennett's "The Russians are Coming" which is a variation on Dave Brubeck's "Take Five". The closing credits music is another part of the same track which contains the more recognisable melody and 5/4 rhythm of "Take Five".
Tim Hunkin released a remastered version of the series, complete with retrospective commentary, on his YouTube channel. He pays tribute to the late Rex Garrod in the central heating episode.