[NTG-context] \blank space at the top of a page

Hello list I have been trying to find a solution to how to insert blank lines before a chapter heading at the start of a page. In the following example the \blank[4*big] is ignored. The solution I've found is to add an empty box using \mbox{} before the \blank command. Is this the right way to do it or is there a more elegant way that I am missing? Many thanks James \setuphead[chapter][before={\blank[4*big]}] \starttext \startchapter[title={No space above this chapter}] chapter text etc \stopchapter \setuphead[chapter][before={\mbox{}\blank[4*big]}] \startchapter[title={Chapter with the right spacing}] chapter text etc \stopchapter \stoptext