I'm guessing that your server over in the UK is running php, and as a result of that you won't be able to query through it directly for the source of the script because php would always process them before sending, you'd have to create some sort of portal on that server, either have a backdoor script on the US server that runs the show_source() function on the specified page, and have the UK server's copy of php query that script on the US server and pass the data through and display on the UK one. You could also use php's ftp functions to transfer the file if you have ftp access to the US sytem and then run the show_source() function and then delete it. Thou most of this would cause way too much overhead, it'd be simpler to just have a copy on the UK system to begin with.
Personaly I really don't see why you'd want to keep the actualy scripts over on a system half way around the world, why don't you want to just copy it to the UK server for direct use there?