Horizontal note spacing in chant template

[richard]

Hi, I've been using the Anglican chant template to set items for our choir
and I've just a note spacing problem with one chant (Walford Davies) last
quarter.
 
How do I address the note spacing for the B/C clash in the 3rd bar?
 
Now if there's also an easier way to show that voice split in the tenor
part, I'd  appreciate it.
 
Thanks
 
Richard Griffiths
 
\version "2.24.0"
\language "english"
 
global = {
  \key c \minor
   s1*4 \bar "|."
}
TenorMusic = \relative {
  g1 af2 c2 c2
  \new Voice = "melody" {
    <<
      \new Voice {
        \voiceTwo
        \stemUp
        bf4 af4 g1
      }
      {
        \voiceOne
        c2 c1
      }
    >>
  }
}
BassMusic = \relative {
  af,1 df2 c2 f2 bf,2 ef1
}
\markup {
  \fill-line {
    \score {
      <<
        \new ChoirStaff <<
          \new Staff <<
            \clef "bass"
            \global
            \new Voice = "Tenor" <<
              \voiceOne
              \TenorMusic
            >>
             \new Voice = "Bass" <<
              \voiceTwo
              \BassMusic
            >>
          >>
        >>
      >>
      \layout {
        \context {
          \Score
          fineBarType = "||"
        }
        \context {
          \Staff
          \remove Time_signature_engraver
        }
      }
    }
  }
}