My guy do not mention UK at all if you are interested in going to Canada. Once you do, you may not get the visa. I have guys who were in this position although for other countries, they never mentioned countries where they were denied visas, and today they are all citizens of those countries. I know a guy in Canada now. He was denied by USA, he never mentioned it in the application. He is now studying. Overlook the advice to implicate yourself. Thats just my advice.
Do you know there is a guy who told me his brother always overstay in each trip to UK but always tip them at the airport to back date in his passport that he only stayed for 2 weeks? He has never been caught during the visa renewal.