Just received an email from Jonathan Potter Limited about their new catalogue and 2012 London Map Fairs.
I have not been a fair specifically for maps in Hong Kong or elsewhere in the world. Going to London in this summer seems to be impossible unless I win a sound lottery but I am planning my long trip to my second 'home' in 2013. Hope to attend an AGM of the London Topographical Society in the early July too.
London Map Fairs: http://www.londonmapfairs.com
London Topographical Society: http://www.topsoc.org