[NTG-context] space between chapter and chapter number (in words)

[jbf]

I wonder if someone could explain to me what controls (or how to 
control) the space between Chapter and chapter number in my TOC given 
the setup I have.

At the moment I get ChapterOne instead of Chapter One, and I do not know 
what is causing that.

Here is my set up (at least all the parts that I think are controlling 
the appearance of Chapter Number in the TOC). Am I missing something? I 
thought perhaps the third line in the ChapterListCommand below might be 
what controls this, so I did try adding \hskip 1em (or 2em etc.) in the 
\currentlistsymbol section of that line, but it did nothing to solve the 
problem:

\define[3]\ChapterListCommand
   {\hbox\bgroup
      \hbox to 2.5cm{\currentlistsymbol\hss}% number + labeltext
      \vtop\bgroup
        \hsize\dimexpr\makeupwidth-2.5cm\relax
        \doifsomething{\rawstructurelistuservariable{year}}
          {{\structurelistuservariable{year}}\crlf}%
        \currentlistentrytitle % title
        \doifsomething{\rawstructurelistuservariable{author}}
          {\crlf{\structurelistuservariable{author}}}%
        \hfill\currentlistentrypagenumber % pagenumber
      \egroup
    \egroup}

\setuplabeltext
   [en]
   [ chapter=\bf Chapter  ,
    ]

\setuplist
   [chapter]
   [label=yes,
    alternative=command,
    command=\ChapterListCommand]

Julian