Thanks for that DF.I can however understand the OP's frustration because that has never been explained anywhere on VOD..
It's the lack of info that annoys me plus coming across the 3rd or 4th series of a show when I've not had a chance to view the 1st or 2nd series.
It's possibly not how I and others understood VOD to work,possibly foolish of us but none the less frustrating especially to new customers.