Lisboa delicatessen is a good place, and they have few branches in stockwell I believe too. There's a few portuguese/brasillian shops down Harrow Road in Harlesden way.
However, ASDA do stock them, and my cornershop. So that's how I grab a hold of mine.
Im portuguesse, so accquiring superbock comes easy to me. :P
http://maps.google.co.uk/maps?f=q&source=s_q&gl=uk&g=4+Plender+St,+London+NW1&q=lisboa+delicatessen+london&btnG=Search+Maps
Lisboa delicatessen is a good place, and they have few branches in stockwell I believe too. There's a few portuguese/brasillian shops down Harrow Road in Harlesden way.
However, ASDA do stock them, and my cornershop. So that's how I grab a hold of mine.