The "Classic Tack" is not what I'd call "English Tack" to me English is a snaffle type bit (or on a Double Bridle, a bridoon and curb as seen on the headshot image, this one has a "Flash" nose band which is the strap that goes under the bits and connects to front of the noseband) not one that just has a curb bit like the Classic or Western Tack.
I would love an proper English one made just for Harry, I'd also like to see it with options like no noseband, a normal Cavesson nose band and a grackle (looks like a figure 8 across the nose, it sort of works like a combination Cavesson and drop-nose bands as seen on the full horse image). I'd also love a Jumping set up similar to this with saddle, and breastplate and martingale, as well as a Dressage saddle.
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I've had some success with the Mil horse English tack (very fiddly tho). And there is a Headstall that fits Mil, Poser and Harry (it fits the Shetland but you have to shrink it and move it around a little)