Simon , thanks for your help, I've tried this.
The NAS is connected to a Mac and I use Safari and a supplied IP address, the download is temperamental but the activity light indicates activity. It can take minutes to load the "web page".
I have connected a Mac to the TC via ethernet and used an app to obtain IP address. I type this into the NAS and then connect to TC. Zilch!
Where am I going wrong?
Thanks again