Thank you, Taco, for the fix and the helpful explanation. 

The file now works (and I can now put this project to bed!)

Alan

On Wed, Sep 30, 2020 at 7:44 AM Taco Hoekwater <taco@elvenkind.com> wrote:


> On 30 Sep 2020, at 11:46, jbf <roma83537@gmail.com> wrote:
>
> For some reason that I cannot work out, the recto page header is not appearing in frontmatter sections like Foreword. It is important to note that for this item I am using:
>
> \definehead
>   [foreword] [chapter]…

‘chapter' suppresses the header by default on the first page.

at a guess:

  \setuphead[foreword][header=start]

Best wishes,
Taco

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