Wow!
The space and line mod is perfect, and it took me no time at all.
I've been just looking at it for ages, clicking in and out of the list page.
(I know I get excited far to easily, but there you have it)
It's so much better than it was. Thanks gjh42, you're a star!

I went into the picture measurements list in my admin section and changed the size of the pictures in the list so that they are always the same width with no measurement for the height, that made it better still.

I'm off to try out the header suggestions now.