Thanks for your assistance but smaller files e.g. 10MB are transferred without any problems so PHP timeout seems to me very reasonable e.g. http://stackoverflow.com/questions/16102809/how-to-upload-large-files-above-500mb-in-php
I was wondering if there is some kind of file upload field which will use chunked upload plugin e.g. plupload (http://www.plupload.com/)?
