Sub Articulo 93.1

Can be tricky - if you do things the conventional way, you need to make
the header box large enough for your first page header on the first
page.  Unless you then play very silly buggers, subsequent pages have a
lousy page layout.
I get round the problem by re-writing the \address command (and the
\opening command, but that's a side issue).  One example is:
\address{%
  {\large \bfseries \ML@fromMAGline    
          Motorcycle Action Group \ML@up(UK\ML@up)\strut%
    \hspace{\fill}\ML@drawlogo}\\
          {\large \bfseries \ML@frombranchline 
         Bolton and District Branch\strut}\\
  {\normalsize      \ML@fromaddressline
         93 Not Really Road, Bolton, BL9 9XY\strut}\\
  {\normalsize      \ML@fromtelline     Tel 01234 567890\strut}\\
  {\normalsize      \ML@fromemailline   
         email \RMemail\strut\hspace{\fill}%
    }%
  }
The \ML@fromline commands are defined to be fount selection
commands; \ML@drawlogo draws a logo; \RMemail prints my email address
(using stuff from the url package).  \ML@up lifts its argument a little
bit - it makes the (UK) look better if the ( and ) are slightly raised.