Aye, also threads like this are not very encouraging:
http://www.canadavisa.com/canada-immigration-discussion-board/chc-london-from-april-2011-to-october-2011-t66389.60.html
Some guy called Nectar (who doesn't seem to want to tell anyone where he gets his information from) reckons that the priority at CHC London is post-Feb-2008 to June 2010 applications, and that >J26 will be priority in October 2011.
As much as I struggle to believe CIC would allow some people to get their visas in a few months and others in the same process not even looked at until October (somce 10/11 months after PER received), the longer this wait continues the more I will start to believe this Nectar guy!
Wayne.