Something to remember is that Flickr Groups are a great source for WNBR photos, including some that aren't otherwise viewable because of privacy settings. You need to be a member of the group to see those photos but joining most groups is one click.
There are *many* WNBR, Solstice, etc groups, these are two good ones:
https://www.flickr.com/groups/nakedwomenonukbikerides/
https://www.flickr.com/groups/2970241@N20/
As an example, here are some Manchester photos from the WNBR - Top Rated Photos group. I haven't seen any others from Manchester this year.