Basically what I have done is use the existing "Zone Rate" and increased the number of zones to 4 this gives me Zone 1 for United Kingdom (GB), Zone 2 for European Countries, Zone 3 for World Zone1, and Zone 4 for World Zone2. ALL of the Zones are from the UK Royal Mail "Your Guide to UK and International Postal Services (July 2002)" and "Standard International Services and Prices (July 2002)".
The second zone rate (Zone2) is a copy of the .php files and changes to the required variables. This caters for the UK Recorded Delivery so there is only 1 zone (GB) and the rates only go up to 3kg as after that it is cheaper to send via courier.
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