There are two ways around the ip limit, either use a uk proxy or if you look at the url for the streams, you'll notice there are flags present you can toggle or rename an extension (ie. .wxx becomes .wmv).
for example I clicked on an eastenders clip and got "We're sorry. The content you requested is available for UK users only." so I just add "&nbram=1&bbram=1&nbwm=1&bbwm=1" to the end of the URL and it works fine.
stinkfoot - I don't live abroad full-time. It just irks me that the people who (perhaps) might benefit the most from this - British living overseas that would love to be able to watch some BBC TV - are missing out - there's no mechanism for me, even as a license payer, to access the content.