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The B Mark VI was a chemical incendiary, often called the "de Wilde", that came into service in early 1940. The name was a cover, as the design only owed about 10% to de Wilde, the majority of the work being carried out by Major Dixon.
The anti-Zeppelin round you are thinking of is the Buckingham Mark VIIB, which was phosphorus filled and was designed by the eponymous Mr.Buckingham of Coventry.
British nomenclature changed in 1926 from the WWI style that used a suffix code letter, e.g. VIIB to one that used a prefix letter as in B Mark VI.
You are obviously in need of my book on headstamps and markings of British service .303 ammunition!
(I thought that was a very neat segue into a commercial for my book)
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