This is a heritage variety that my father remembers growing in the 1930's though it dates from at least 1844. A famous strain of this variety was sold by George Wheeler of Warminster, Wiltshire, a few miles from Dad's home in Devizes. Dad and I spotted the advertisement in Devizes Museum.
Wheelers gained an international reputation for this cabbage variety. The packets had a red wax seal, to prove that they were the genuine Wheeler's strain.
It is a classic pointed Spring cabbage, quite compact, so you can plant them a foot apart, harvest every other one for Spring greens, leaving the rest to form heads.