It seems that the TV film was never released on VHS (and there have been no moves to put it onto DVD).
Your only chance of getting hold of the movie is to find someone who recorded it and then transferred it to a DVD-R (which will play in computers but not in many DVD players). Send an email to [email protected] who seems to be offering such a disk here:
http://jeansimmons.netfirms.com/tv.html