Thanks for the reply Mirdas. Unfortunately, I need to take account of both weight and dimensions (ie, whether I am shipping a large letter size or small parcel).Thanks for your suggestion, I'll see what I can come up with Jed 

Hi All  Can someone help save my hair before I pull it all out!! I am trying to set up shipping costs so that it is calculated based on actual rates charged by Royal Mail (I am in the UK). When I try to set up the rates in Settings>Shipping & Delive...