I checked them out on tobacco reviews... Full English did OK but the others not very highly rated. They do make Presbyterian but in tins only so it obviously doesn’t qualify for this offer.
Me thinks they have these obscure sales to get some of the less popular blends moving.
They have a rotation of sales throughout the year. Usually twice/year on Sutliff, Peter Stokkebye, Cornell and Diehl, and Planta. The recent Pease sell was the first time I've noticed that brand on sale.