Add me to the choir suggesting the Gawith Dark Flakes and ropes. Dark Flake Unscented is my favorite but 1792, Lakeland Dark, Conniston Cut Plug and the scented/aromatic version of Dark Flake are all good as well.
In terms of the more readily available, I'd suggest MacBaren HH Bold Kentucky and HH Rustica, Peterson Irish Flake/Rattray's Stirling Flake, C&D Burley Flake #1 and GL Pease Jackknife Plug as blends I'd consider strong, if a touch less so than the Gawiths.
In terms of the more readily available, I'd suggest MacBaren HH Bold Kentucky and HH Rustica, Peterson Irish Flake/Rattray's Stirling Flake, C&D Burley Flake #1 and GL Pease Jackknife Plug as blends I'd consider strong, if a touch less so than the Gawiths.