This plugin is the answer. Its free, it took less than 5 mins to install and activate and it means I can have simple URLs like www..com/landingpage
It should also be cross posted in the Landing pages catgory of the JED.
Setting up streaming from Amazon S3/Cloudfront isn't the easiest task in the world,
Rudolph the developer went beyond his remit in helping me with issues on S3 that weren't strictly to do with his Extension at all but more to do with me doing things wrong on S3. The extension isn't perfect, there are a few minor bugs but nothing too problematic and I have faith they will be fixed given the quality of the rest of the support I received.
If you need to stream or download content from S3 via protected links on your Joomla site then this is the extension for you.
It does everything I need, was easy to use and had great support. I logged a support ticket and although the problem turned out not to be with this extension but with K2 the support guy helped me fix it anyway. I think that's great support.