Thanks again Ashton!
I’m feeling a bit sheepish about that mistake.
I’m afraid the following is true:
‘category page, which is based on the template of my single.php page’
I created a category.php, as I didn’t have one and pasted my single.php code into it.
Having said that, I don’t think I entirely understand the WordPress system yet.
So I have been doing quite a few ‘irregular’ things to get it to do what I want.
This is the beginning for me. With a CMS, I mean.
I have been wondering whether I shouldn’t rather be spending my time learning DRUPAL.
They say it’s a tough system to get into, but it can achieve almost anything when you know it.
I am no programmer, but I code my own sites. Need to get to know PHP better. WordPress is helping me familiarise myself with this. Perhaps it’s a good stepping stone. There is so much to know!