FYI
http://upcoming.yahoo.com/event/4067747/
"Flickr Crop Shop"
Sunday September 27, 2009 from 11:00am - 4:00pm Victoria and Albert Museum, Cromwell Road London, SW7 2RL
Sunday 27 September Digital Studio, Sackler Centre 11.00-16.00
Not Wikimedia UK related, I assume.
"Learn the art of photo cropping in Photoshop...."
Personally, I use the GIMP.
Gordo