Re: similar looking aircraft
"'Did the body of the Sea Vixen generate lift?'
Good point, I'd be stunned if it didn't, I mean it's basically a wing with a pod..."
Indeed, the Sea Vixen is more flying wing than lifting body but it will get some lift from the center section, just not a significant amount as it would only be generated from a fairly narrow strip along the center line - the closeness of the engines to each other leaves little lift area between them.
Flying-wing designs can have some very unpleasant high AoA departure characteristics making them unsuited to the fighter realm - have a read about how Edwards AFB got its current name.