Which was designed by the French as the Super Caravelle years before we formed the partnership. A patnership was agreed for each country to design their own SST for the best to be selected.
Our design was rejected, the French enlarged design of their Super Caravelle was adopted, and it was that which we jointly developed with the French in charge. This link informs
Further evidence of the French being the designers is the name Concorde with that e on the end, the French not allowing the English spelling despite Michael Heseltine's efforts to get it changed.
And in honour of the French design and leading development role, French built Concordes had all the firsts, first flight, first passenger flight, first transatlantic flight, and when it was to be decommissioned, the final transatlantic flight.
Britain has never designed a single successful intercontinental jet airliner. The nearest we ever got was the VC10, but since it was far too expensive to operate compared to the 707 no-one would buy it, so the government forced our national carrier to operate it. It brought them to their knees financially, so the VC10s were given to the RAF to operate as troop carriers and flight refuelling tankers on the MOD budget.
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You know as well as I do that without British ingenuity they couldn't have got the weight down to make it operational.
And you know what's funny. You want your cake and eat it.
On the one hand it was a disaster. An enormous waste of money. Yet the French were genius and it was all them.
What gives?