Thanks for all the advice an tips.
I looked at all your suggestions.
Did some more researching.
Sadly nothing came up that is Free, popular and can create folders within folders.
In the end I settled on Imgur.
It does folders, but not sub-folders.
I made some Pork Crackling recently and wanted to share the process, so a few test images ...
Well, that was fairly painless, lets just hope they stick.
Thanks again for the suggestions
David