Warming Up

HELP!! I saw this movie a few times as a kid with my father, he loved it. I remember him laughing out loud and remember some of the plot. Sadly I forgot all about this movie until recently when my family and I were discussing it, this is after my fathers death. However, I cannot find it anywhere, not online, not in stores, not streaming services. If anyone knows how to get a hold of this film, I would really appreciate you commenting on the feedback section like I have and advising where I can find it. It is a top film from my childhood, lots of laughs and a nice family film to watch together. Please do comment if you can HELP!