Charles, i read about your pricking out method and employed it successfully with lettuce. Can you do it with all salads that have a great germination ratio -and little seeds?
Almost every seedling can be pricked out except plants which make a taproot such as carrot. But brassica salads such as rocket germinate evenly and quickly so sometimes it is easier to sow them direct in modules, or in the ground, and their seeds are large enough to handle. It depends how you like to do it.