When I did an advanced search just now for a particular username from yesterday to today, the results came up, but when I clicked on the link, it generated the URL incorrectly, so instead of:
www.mumsnet.com/Talk/relationships/....
it came up with
www.mumsnet.com/TalkTalk/relationships/...
with the extra Talk/
So of course it didn't work and I had to delete the extra characters.
Just a heads up!