Hi Mily, we're probably not close enough to you to be convenient but we run a fish box scheme called Faircatch
http://www.faircatch.co.uk with collection points on a Friday afternoon in Wandsworth - Barmouth Kitchen (2 Barmouth Road, SW18 2DN) , Battersea - The Draft House (94 Northcote Road SW11 6QW) and Southfields - Cakes by Robin (26 Replingham Road, Southfields, SW18 5LR). Our fish is generally brought up from the coast on the day it was caught so really is the freshest fish in London, and it's all caught sustainably by small boats using environmentally-sound methods. Please try us out or like our FB page
https://www.facebook.com/pages/Faircatc ... 6658791516 Any questions, do drop me a line
guy@faircatch.co.uk Thanks