Sub-Roman Britain (Cavalry etc)

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Cavalry? the rider can't be much nimbler than the horse he's riding, I'd suppose, so a clunk-footed mount would negate most of the agility of its rider. But that's not documentable, really.

On the other hand, a chuck footed rider will not get anything good out of the best of horses.... 8) , except perhaps a bolt to the rear, of a wander off course to the greener pastures.....

Well, if they're that "chuck footed" they wont be doing much riding as they will probably be admiring their horses from the underside side up, on the deck, denting their armour (or bending their leather) depending on your school of thought!