Garry - Don't know if this can help or not but back mid 2009 Kennedy22384 gave us an attachment called Method 260.
Do a search and you should find it.
It's an Excel program that picks up the data from Unitab and processes it.
I don't know anything at all about grabbing data from sites but thought if 260 can get data, you might be able to modify it to do what you want.
I used it yesterday to see if it still works with Unitab and it does.
Hope it helps you.