Sorry, but I'm not tracking your question. One can say a lot about British cavalry.
My previous post was intended to support the posts by yourself and Rod. Your post mentioned Siborne with respect to British calvalry management during the French cavalry charges. I commented that Siborne has some very useful letters about conduct by British heavy brigade commanders, showing errors even when they knew better. By 1815, the British cavalry arm possessed some very sound brigade commanders and experienced regiments. It has been commented by various authors that a number of the British heavy regiments lacked experience and that this contributed to the failure of assigned regiments to stay in reserve.
I figure you must be refering to a stereotype of British cavalry, but any such really didn't apply to the more experienced Peninsular regiments. However, I suppose just about any negative stereotype could be applied to some, though not all, of the heavies.