No, I don’t want to set a different page style except to get a page number, centered, at the top of most pages. The margins are all set as required for a paperback.
Since posting my question, I’ve tried using style->styles and formatting->page number and then insert->field->page number and then line break and that seemed to work for some pages - but on others, the formatting of the following paragraph was all messed up again. I tried it again after using format->clear direct formatting on the offending paragraph but that didn’t work either.
Presumably other people have done this before, so I must be missing something - but what ?