On the BBC WritersRoom site, it says: "Always be specific about what kind of drama you are writing, where in the schedule it might fit, and what kind of audience it might reach. Is it a continuing, prime-time soap in thirty-minute episodes? A returning crime series in sixty-minute episodes? A six-part, post-watershed serial? A pre-watershed, sixty-minute single drama? Remember that writing for established formats isn't the same thing as writing to a formula – an established format allows for individual expression, but it's hard to be individual when writing to a perceived formula." But it doesn't actually cover what formats there are. I was wondering if somebody could fill me in on this?