Okay there is an error in UKZR 2.3.5 from a global search and replace that went wrong.

http://########################.co.uk/versions/ukzr.txt

is a corrected versions and it should be renamed ukzr.php and the used to overwrite includes/modules/shipping/ukzr.php you will not need to remove and re-install it, the shipping, weights and number of boxes should now appear. Let me know how you get on, then it'll be put into the next package
thank you
Philip.