Nice wagon. It's even got the Cougar emblem. I love it. Here in the states that model was called a Montego. We did have a Cougar wagon in the early 80's and one of our forum members here has a gorgeous example of one. Welcome aboard.
Mercury produced Cougar wagons in '77 and '82. The number of '77s is around 9,700. The Cougar actually replaced the Montego in '77. My 82 is another badge engineered Fairmont. The Cougar wagon replaced the Zephyr wagon in 82. Check out the registry. Hardly any around...http://www.cougarsw.flacarshows.com/