A leading UK broadband comparison service has warned that users taking advantage of the BBC's new HD iPlayer could run into trouble with their Internet service provider. Even on many unlimited broadband packages, fair usage policies apply which could see users either charged, speed throttled or facing dropped connections if they exceed certain download limits, particularly during peak times. While the iPlayer certainly isn't the only application that can use a large amount of bandwidth over a short period of time, its move to high definition format means that more data needs to be shifted over an Internet connection...