I found this both on "Tamp and Puff" and "Tobacco Reviews," the below posted by ChuckMac on TP who may well be our own "williamcharles":
Brand: Gawith, Hoggarth & Co.
Tin Description: All our twist tobacco varieties are manufactured by the same spinning process using dark fired wrapper leaves. The filler is again, predominantly dark fired leaf with the addition of a small percentage of dark air cured Indian leaf. They are therefore strong tobaccos. Black Twist, because the cooking process removes some of the stronger tar and nicotine elements, provides a milder smoke than the brown twist. Kendal Twist - The traditional strong smoking & chewing tobacco, provides a very strong but remarkable cool smoke. Unsuitable for the beginner. The sweetened and rum flavoured variety add additional interest to the smoke Sliced Black Aromatic - Manufactured with the same tobacco as brown twist, but then put through a further process of cooking under pressure to turn the tobacco black. The cooking process does remove some of the stronger elements from the tobacco so black twist is not as strong as brown twist, but this is only relatively as it is still a very strong smoke. The twist rope is thin cut into small round segments before the addition of the aromatic top flavour Sweet Rum Twist - The main feature of this tobacco is the addition of maple sugars blended with rum to the 'filter' leaf. This is then spun into a rope form before being made into a roll which is cold-pressed overnight We also produce extra sweet Twist and are able to add a wide range of flavours, including black cherry, aniseed, liquorice and apple.
The italicized portion upholds what my palate is telling me about the same/similar tobaccos used by GH in its dark HO blends. Dark Flake is listed as having dark-fired Malawi and dark Indian air-cured. The above also says that the wrapper is dark-fired and that all of the tobacco is VA. Some respond to this last statement with amazement as the tobacco in rope tastes nothing like what they are used to tasting as VA. I agree. I've read that what we call VA is nothing other than the generic descendent of the tobacco the American Indians were growing when the Europeans came. At any rate this strain does not taste anything like rope. To call this tobacco a VA or the tobacco base in 1792 VA is vague and meaningless.
The tobacco in Royal Yacht tastes like a VA, and it is very strong; though I'm sure there are others, VA is not noted to be strong. In this sense also is it a misnomer to toss of the adjective "VA" when describing the tobaccos above.