If you would like to resize the video, there are great instructions on this page http://www.freewebs.com/balmyjanuary/Tutorials/YouTubeVideoResizing.htm
Thanks Michael, Those instructions look really useful. Will have a go when I am back home in a day or two.Margaret
OK success. The proportions of h = 275 and width = 440 seemed to work here. Thanks Michael!
Hmmm they did work, now they don't!
No panic... yet.... all of YouTube is down at present...