They released two more cassettes in 1982 , each with five episodes from the second series .
In 1980 , Thorn EMI Entertainment released six VHS video cassettes in the UK , each with five episodes from the first series .
Thorn EMI Entertainment released two more cassettes in 1982 , each with five episodes from the second series .
In 1980 , Thorn EMI Entertainment released six VHS video cassettes in the UK , each with five episodes from the first series .