You could put it up as a forum post on the OGA website - or they can also send an email round to their growers.
There's Langridges in London if you don't manage to find more locally.
You can also add to Soil Association marketplace - http://www.soilassociation.org/farmersgrowers/classifieds
Ben
On Thursday, June 14, 2012 9:25:41 PM UTC+1, Emily O'Brien wrote: