When I open a new document the cursor is right at the top of the page, ie
with no white margin. The 'line' position is correctly shown as 1, and the
'At' value is correct ie 2.5cm in this case. I have experimented with the
View settings without success and the Page Setup values all seem to be
correct. I cannot see what I have changed that could be causing this
behaviour.

When printed or previewed the document is fine.

Can anyone suggest anything please?

Ta.
Bill.