Multiple Staves on a Page in lilypond-book

[Tim Sawyer]

I'm trying to write a set of exercises on a page for a tutor book.  There are 
nine staves to a page, with a number at the start of the line (1 to 9) and a 
stave to the right of the number, containing four bars.

An example can be found at 
http://www.progressivepercussion.co.uk/Volume1/sample1.pdf (page 3 onwards)

This example was produced using lilypond 2.0, I'm now trying to upgrade to 2.6 
and get the same effect, but I'm having problems with the numbers.

My source is formatted like this (2.0 version)

\newpage
\subsection{Exercises}
1.
\begin[20pt]{lilypond}
  \score
  {
    \notes
    {
      \time 4/4
      \property Staff.TimeSignature \set #'style = #'()
      \clef bass
      \stemUp
      f4 r4 f4 r4 f4 f4 f4 f4 f4 f4 f8 f8 f4 f4 r4 r2 \bar "|."
    }
  }
\end{lilypond}
2.
\begin[20pt]{lilypond}
  \score
  {
    \notes
    {
      \time 4/4
      \property Staff.TimeSignature \set #'style = #'()
      \clef bass
      \stemUp
      f4 f8 f8 f4 f8 f8 f4 f8 f8 f4 f8 f8 f4 f8 f8 f4 f8 f8 f4 r4 r2 \bar "|."
    }
  }
\end{lilypond}

in 2.6 I'm doing this (from a different section, so different notes):

\newpage
\subsection{Exercises}
1.
\begin[staffsize=20]{lilypond}
\score
{
  \version "2.6.0"
  {
    \time 4/4
    \override Staff.TimeSignature #'style = #'()
    \clef bass
    \stemUp
    e4 e4 e2:32~e4 e4 e2:32~e4 e4 e2:32~e4 r4 r2  \bar "|."
  }
}
\end{lilypond}
2.
\begin[staffsize=20]{lilypond}
\score
{
  \version "2.6.0"
  {
    \time 4/4
    \override Staff.TimeSignature #'style = #'()
    \clef bass
    \stemUp
    e2:32~e4 e4 e2:32~e4 e4 e2:32~e4 e4 e4 r4 r2  \bar "|."
  }
}
\end{lilypond}

My problems with this output are that the numbers appear to the left of the 
music still, as they did with 2.0, but are below the stave rather than on a 
level with it.

I have read the lilypond book documentation, and messed around with the flags 
in the \begin tag but still can't solve this problem.  There doesn't seem 
to be a mention of this change in the NEWS documents.

Can someone point me in the right direction please?

ta,

Tim.