I have added more info and pictures to the March Brown Patterns on my site.
The March Brown is the (Rithrogena germanica) and Late or False March Brown (Ecdyonurus venosus) of Europe, to all intents and fly dressing purposes, these are the same fly.

I don't suppose they are all that different from the various North American March Browns, so the patterns may be of some use.


http://www.dtnicolson.dial.pipex.com/page211.html