We visited Taqueria yesterday. We're both Mexican, and when we walked past it it looked like a reasonably sensible/authentic place, so we thought we'd give it a try and sample some of their tacos.
The verdict - not a bad place to have Mexican food, especially given that this is, after all, the UK (not exactly a place where there's knowledge about what Mexican food is about). I doubt there are similar places elsewhere in London.
The sopes were quite good (though we found the green salsa in them lacking some oomph, but then again that's probably what the market wants). The masa of the sopes was nice.
The tinga tacos were nice, if a tad too soupy (so the tortillas get mushy real fast).
The carnitas tacos were my favorite. Pretty good, even for a Mexican.
Pastor tacos merely adequate at best (then again, not even in the US did I ever find pastor that truly approximated what tacos al pastor in Mexico are really like).
Arroz with plaintains - a bit bland.
The sopa de tortilla was excellent, and a good deal at 3.50. (Some of the tacos were pricey at 5.50 for two small tacos)
Of course, tortillas are a weak point. But there's no way around that in the UK I gather.
Sadly, tortas were not available yday (I think they are only available on weekends).
Overall, not a bad experience. And probably a good entry point to Mexican food for Londoners.
Price: reasonable by London standards (of course, unreasonable by US standards, and needless to say insanely expensive by Mexican standards... but we've been too long here to care about comparing to cost of living in Mx or the US even). We had quite a bit of food for 30-35 pounds.