Shaun reports via personal email:
"I have just uploaded a photo through the mobile Web interface and it's given the photo a date of 1/0/1970. See attached screenshot."
This is the photo in question:
http://www.cyclestreets.net/location/44119/
I think the reason is that that photo doesn't seem to have any date info in it. (Download the original from that page and inspect.)
I have therefore tested it with CycleStreets' htc Wildfire Android, Feste to upload this:
http://www.cyclestreets.net/location/44120/
... which works fine.