In July 1955, the Oxford and Cowley were joined by a six-cylinder model with the same bodyshell except suitably lengthened and strengthened at the front for the bigger engine: the Morris Isis with the BMC C-series motor of 2639cc, and a little more chrome, of course.

Note that the pictured Australian car has the later style mesh grille; optional extra sunvisor and radio; and unusual chrome flashes on it's side - all Series I Isis' that I've seen have only a single strip running from the headlamp to the centre of the front door (and no two-tone paint!). It's bonnet isn't shut properly either; panel alignment at Morris Motors wasn't that bad!