Is Download later available in the UK?

Is this available in the UK? I cannot get it to work/it doesn't ask me on my iPad, iPhone or Mac. It should as I have iTunes in the cloud. On my Mac it wants to download straight away, on my iPhone it says it is over 50MB (obviously it is, but if it asked me to download later I would choose that), I tried buying a couple of movies and it doesn't ask me - I really want to download later!