Good tasting burritos - price is reasonable. Queues during lunchtime are usually long - takes about 5 to 8 minutes before you reach the counter where you place your order. Staff are efficient - one heats your tortilla, another puts the rice, another the beans and meat, etc. I've been to another Tortilla branch and this one on Southwark is better. There's a lot of space (about half of the customers opt to take away their orders and eat them elsewhere, probably in their office!). The staff clean up immediately after a customer leaves. They offer refillable soda drinks, which is a good idea if you put too much hot sauce on your burrito.
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