Thanks for coming back to me - hopefully these answers will help you to help me.
In the Publish Site dialogue box under Publish files to - it says 1and1
I'm not even sure what or where the passive mode is so I doubt I have it turned on!! If you can point me in the right direction I can always go and check again. I have uploaded versions of this site before and wasn't aware I'd changed any of the settings between then and now.
The URL is:
www.thesittingscribe.com
Good luck and I hope you find the root of my problem (it's probably operator error!!!)