Well since posting I realised that the ipad app is also available for iphone which solves the problem. Apologies for not realising this earlier. I wanted to be able to use my photostream as mostly I use the phone to take photographs but look at them via photostream on my ipad. I just need to revise the workflow to upload the photo's from the phone.
It's a fantastic app! Really well thought out and easy to use. Has revolutionised my workflow.