BBC is UK geoblocked. The plugin has ability to assign proxy server IP (UK), so the OV will use that IP to connect to BBC web server.I have no idea what you mean! How can I provide a working IP and what is a "fiddler dump"?
Fiddler is useful app to monitor http traffic on your computer. It's basically man-in-the-middle-attack http proxy, i.e. sniffer. If you setup proxy of your web browser, then you can see all traffic made by the browser in the fiddler and save it as a file.