A little ways south of Highway 402 exit 25. Good service was received on a Saturday night. Drive-thru service is available.
Their location at Reeces Corners, the north-east corner of Oil Heritage Road and London Line Road, is a great stop close to the border for some of my travels. The have the usual Timmy's menu - sandwiches, muffins, donuts (maybe bagels), hot drinks and cold refreshments, as well.
The restroom was clean, the free WiFi worked flawlessly. Inside dining is always available, open 24/7.