You're testing my memory now mole - over the past 9 months I've checked a number of .org drops and found that they had switched to .org.uk - Internet Archive links showed the changes - (none I personally reg'd).
New reg's for many organisations in the UK are also automatically .org.uk by choice so there is a market there.
Some have been long-standing choices, e.g. royalwindsor.org.uk (I have royalwindsor.org).
Though it's true that others have moved away from "org" altogether, for example I reg'd nhsdirect.org after it changed to nhsdirect.nhs.uk - still gets a good few hits though!