Thanks for the info,
Once you get these worked out though you will then need to craft the shipping charge rules that would be used if the item is more than 25kg. 
Would this involve more custom coding on the page?
When you get to this part you will need to do some editing after the fact to get it working properly.
I'm not sure what you mean here - can you explain further how I'd get this part working?
Can you tell me which pages I need to revise and add this code to within Powerstore. Do I need to delete any of the current code that has to do with shipping providers?
