The Slug and Lettuce is trying to be a British-style pub and on some levels it succeeds very well. The decor is excellent and the place feels relaxed and casual, Check out the gargoyle lamps!
I felt it did suffer, however, from the "bar on Yonge Street" syndrome, which BFT's manages to avoid. That is, the place expects people to drift in and out, and doesn't make much attempt to make new people feel welcome or to get to know individuals and their individual tastes. We could be wrong (and hope we are, as we liked the atmosphere) but the waitress on our first visit, though competent, created the impression that she didn't care whether we were there or not.
On our second visit, however, in the middle of a snowstorm, we had excellent service from a probably bored waiter. He was very friendly and attentive.
In both cases we enjoyed the food. Melanie declared the shepherd's pie good, with the right mix of spices. She was a bit taken aback when it came with stir-fried vegetables. This incongruity seems a feature of the Slug and Lettuce. We were disappointed to see that some British stand-bys, such as mixed grill and steak-and-kidney pie were not on the menu at all. On the other hand, souvlaki is.
We can also recommend the bangers, onions, and mash, and the French onion soup. The place seems to like onions and does them well.
The Slug and Lettuce serves Coke drinks. Expect to pay about $20 for two.