Hi Sharon,
I run (well, don't do much running these days - more casual amble) the One Summer Site, and I live in Australia! I can assure you that ordering from the UK is easy and safe. I did have a bunch of copies for locals, but they're all long gone now. Any of the sites like Amazon or Bensons are very reliable and honest, and the DVD is dirt cheap now too. You don't have anything to worry about.
Caitlin