"A Hard-Riding, Two-Fisted Western Yarn" is the complete story in The Champion #1719, newly uploaded. "Red Against the Ghost Rustlers" has something of a Bar-20 flavour, perhaps intentionally emphasized by the byline "Don Boyd," which in these circumstances you can't help suspecting is a pen-name. Also, hero Red Dugan owns a fine, glossy white horse he calls "Champ." Talks to him, too.
"Sorry, old pal," he whispered, as he slipped the bit between the white horse's teeth. "Thought we wouldn't be riding out again to-night, but it seems we're going to get to grips with these ghost rustlers at last."
Like the villainous Chinese who lisp their words in the issue's Colwyn Dane detective story, it's all delightfully way-back-when. Today, writers for the only UK Western series still running (I believe) are highly discouraged by their publisher from having characters talking to their dumb cayuses!