One of the guys at Denver Autos has a cougar. Not sure which year though. If you are looking for general service parts then try Just U.S. on 0161 476 3361. Ask for Ian and tell him Rob with the 69 Cougar sent you. If you find any 69 parts on your travels email me on [email protected] I am always on the lookout. Good luck!
Also, if you can, join the CCOA. There is a UK division. Barrie Dixon runs it and has a fair wealth of knowledge. Mainly on 67-73 cougars but he should be helpful on the 74 as well.