I went over to Wahaca following reading about it here on Tipped. Being from California, I feel like I know what I like when it comes to Mexican food, and most of what I find in London I definitely don't like. Wahaca was a pleasant change from that poor record.
The place is well laid out in a subterranean dining room that manages to be quite bright despite the fact that its beneath the street. I tried several of the 'Mexican Market' options, and although none of them could quite function as a meal unto themselves, pairing a set of pork tacos with a chorizo quesadilla is plenty filling. I also added in a small bowl of deliciously creamy frijoles and a Pacifico beer and presto, a hearty, quality Mexican meal!
Although upon entering you get the sense that this is the kind of place that could turn out quite costly, I found that it is quite possible to have a satisfying meal for under 10 pounds, which is a real plus.
Make sure to try the habanero sauce, but be careful you don't give yourself too much! It's the real deal, and very spicy.