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The Britannia wasn't a further development of the Brabazon, it was a separate project developed to address a different design category called for by the Brabazo

The Britannia wasn't a further development of the Brabazon, it was a separate project developed to address a different design category called for by the Brabazon Committee -- what the committee called a "Type III" design, as opposed to the Brabazon, a "Type I". (The Comet was also developed to fill one of the committee's categories, Type IV.)

NeedMoreTea 7y ago
Hmm, I thought that was a cancelled Avro. Britannia only coming into being after it had been cancelled and put out again. Course I may well have blurred the timeline too. :) Edit: Yeah, Avro 690, which became Avro 693 with Avons by time of cancellation in 47. Spec 2.47 was Britannia, which was indeed type III not type I, so I'd muddled the timeline too.