I appreciate your comments Robert, and I have looked at the gdata libraries 
in some depth. However this is code that has been wroking perfectly fine for 
12-18 months without a problem. I have checked the HttpRequest object which 
sends the request from within the gdata libraries and examined the http 
headers and the actual xml which is sent and can see nothing wring with it. 
I am fairly convinced the issue is at googles sevrers when the call is made, 
as the internal server error is being thrown from there. I have opened an 
issue here -> http://goo.gl/bovO0

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