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It now works.

I have created a seperate function to register the taxonomy and that has done the trick.

So I think the proble was where I was registering the post type and taxonomy within the same function.

Many thanks for your help.

It is set up in a child theme of a Woo Themes Parent Theme.
It is set up in the child theme’s function.php file. I have also tried setting it up in the parent theme’s functions file, but to no avail.

I am declaring it as follows within the same function where I am registering a custom post type to which it belongs:

$labels = array(
‘name’ => ‘My Custom Taxonomy’,
etc
);

$args = array(
‘hierarchical’ => true,
‘labels’ => $labels,
‘show_ui’ => true,
‘query_var’ => true,
‘rewrite’ => array( ‘slug’ => ‘mycustomtaxonomy’)
);

register_taxonomy( ‘mycustomtaxonomy’, array( ‘mycustomposttype’ ), $args );

and using the action hook ‘init’.

Many thanks for the advise. I found the problem. I had registered a taxonomy called ‘type’ and that must have been causing a conflict. I changed it to something else and it worked.

What is strange is that it isn’t on the list of reserved terms in https://codex.www.ads-software.com/Function_Reference/register_taxonomy.