The first time we went there for dinner the line waiting for a stool at the counter was outside the door. It is a very small restaurant with bar stool and four small tables outside. We decided that the wait was simply too long and decided to go back there the next day for lunch instead.
The next day for lunch, we were the the first in line and got two seats. We were not disappointed with the food. We ordered the grilled razorback clams and they were so fresh and cooked perfectly. Drizzled with some olive oil, they were so sweet and good that we ordered another one! The grilled sea bream was also excellent and fresh. The bruchetta was smoldered with ripe tomatoes. We also ordered the Iberico ham, octopus and blood sausages. Barrafina is a MUST visit restaurant while in London.
Inside tip: Lunch time is easier to get a seat and the menu is the same.