Very many thanks to every one!
I now have the clip I needed. The person who posted it responded to an email and sent me the following links which worked like a dream (once I had translated the DownTube page from Spanish!)
http://www.downtube.com.ar/.
Once I had the clip I had to change it from .flv format to an acceptable format using AVS Video tools which was simplicity itself!
Once again - very many thanks
HWB