In the following, the indentation using \startblockquote is twice what it should be:
\setupdelimitedtext
        [blockquote]
        [before={\blank[small,fixed]
    \setupnarrower[left=1.5pc,right=0pc]
    \startnarrower[left,right]
\noindentation},
  after={\par\stopnarrower
    \blank[small,fixed]
\noindentation}]

\starttext
\input ward
\setupnarrower[left=1.5pc,right=0pc]
\startnarrower[left,right]
\input ward
\stopnarrower
\startblockquote
\input ward
\stopblockquote
\stoptext

What have I missed?

Alan