Thank you for replying so quickly - I do appreciate it.
I had a look at the entries as you suggested and all the entries, both with and without the line breaks, had Normal as the style for the definition. One thing that I did do then was to have a look at the code and took out the <p> tags. I really should have done this before, but I was getting to the point of "not seeing the wood for the trees" as we say this side of La Manche (wouldn't dream of calling it the English Channel to a Frenchman)
Thanks again for the tip about how to do it intentionally, I wil remember that.
Au revoir, et merci encore