A Question for British Folk

Does the BBC (not BBC America) official website re-air a new episode of a show after that ep was aired on TV? Like how the USA Network official website will re-air an episode a week after the ep was first aired on TV. From all accounts, Merlin won't come back until somewhere around January - both on SyFy and BBC America and, dang it, I don't know if I can wait that long (not if I don't have to, that is ;)).