We forgot that we had a Lovefilm subscription and hadn't order a film who knows how long. When I phoned to cancel they suggested the unlimited online service - we can watch as many films as we like whenever we like, including HD films. But when we're watching a film, either SD or HD, there is an ever so slight judder. The laptops and PC are more than up to spec for the job, and we have a 30Mbps Cable connection. (with a reliable ~3MB transfer over ethernet)
So how do I get to the gubbins of Silverlight to tweak it's buffering?