Nice idea on the Bombcorde
I've been thinking along similar lines for a bit now, with a Vulcan replacement being authorised in the 70s. I was thinking of something along the lines of an enlarged Tornado layout, basically a high-wing Backfire with a revised nose. Also, I've had the idea of a strategic TSR.2 (SSR.2?) as part of an AU I've been working on periodically for years. It'd be a minimum-change aircraft along the lines of the FB-111A with a higher MTOW and bigger wing for additional fuel.