Hi,
1. Do you have a list of UK zip codes already?
2. Does the current module allow for radius searches already on the US zip codes?
3. Do you have data on the relative distances between UK zip codes available?
If the above is already available at the start of the project, I can finish it for you in about 3 days period, but need to analyze at their module code, which brings me to the next question, do have access to the source code?
Best Regards,
Yousef