Thanks, it would be good to fix this, but at the moment the site has a huge sale on so I can't enable debug mode etc.
We're also confused about zones etc. Is there a guide for setting these up correctly?
Just been asked to rectify this:
The site is using only "All In One Shipping" and I do not see any weight limits specified. Could there be a setting elsewhere I am not aware of?
There are no weights specified per product, either.