Being someone who has some first-hand experience with American Scotch snuffs, I can tell you that the closest current production British snuffs that could be compared to them would be F&T High Dry Toast and WoS Irish No. 22, although even then American Scotch snuffs are, on the whole, usually ground even finer, are even drier (if that is even possible!), and are much smokier (high proportion of dark-fired leaf, or more likely stem). Both legally, that is to say in relation to taxation and government regulation of labeling and such like, and culturally these products are classed as “dry snuff,” in distinction to “moist snuff” (which is colloquially referred to as “dip” by many Americans users).
They come in both plain and sweet versions, with the sweet versions by far being the most commonly found and popular at the retail level. Why is that the case? Well, interestingly enough these dry snuffs are not usually used nasally but rather are used orally (“dipped” in the colloquial), particularly in certain parts of the American South and mid-Atlantic states, where they can be fairly easily found (although they are nearly impossible to find most everywhere else). Reference to their intended oral use is commonly seen on period advertising back when tobacco advertising was still allowed, as well as in some of the brand names (e.g., Dental) and in the marketing pitch lines (e.g., “sweet as honey” for Honey Bee Snuff; “sweet as a peach” for Sweet Peach Snuff). Nowadays, this oral use of Scotch snuffs is really only associated with older folks (75+ range being the last generation using them that way, really), and mostly only women (older Southern men use loose-leaf tobacco, “chew,” tobacco plug or twist, or dip, the latter being by far the most common).
While they are rare outside of certain areas, I can just about guarantee that if you speak to someone of a certain age (at least 30+) who grew up in those areas of the American South or mid-Atlantic (the only places these snuffs can normally be found nowadays for sale), that they would quite likely be familiar with the practice of the oral use of these snuffs by a grandmother, great-grandmother, great aunt, or other such women in their families or relations. To this day, the tubs they come in carry the same warning labels as other oral tobacco products do (e.g., “may cause mouth cancer…” et cetera). That is a relic of their primary use when those labeling laws first came into effect.
Here is a great example from a stand-up comedian from the American South discussing this exact association between older Southern women and Scotch snuff. It is well worth a watch (I realize the accent might be a bit much for your ears, but is still probably easier for you to understand than how some of the more working class British accents sound to us here on the other side of the pond). On my authenticity meter, this registers at 100%:
That said, there is certainly a consciousness among the younger generations that these snuffs can be used nasally (and they are), but it is seen as a bit of a niche thing or a novelty. I’ve tried them both ways. Orally, they are horrible. I much prefer Swedish snus, or in a pinch a good quality higher-end American moist snuff. Nasally, they are alright, but an exceedingly poor value (quadruple or more the price per weight of European snuffs ordered from Mr. Snuff or Toque), and while some of them pack a punch, the plain ones at least all tend to be rather monochromatic and uninteresting: dark-fired leaf (or, more probably mostly stem) and that’s about it.
They are produced by manufacturers that produce other tobacco products, like popular dips (American Snuff Co., ASC, for example), and there is a common perception among dippers and the like that they are made from the floor sweeping / waste / scrap of the manufacturer’s primary products (which might not be too far off the mark, given the clearly very high proportion of stem material in many of them).
