Here we get into the realm of the AU never-were. IIP&O was in the process of lobbying the Imperial government to allow both the
Concorde-B and the 2707 to fly (without manual reversion) when the models were cancelled. Without either model going into production, the delivery options (10 on Condcorde-B and 6 for 2707) were allowed to lapse. Rendered here are both aircraft in IIP&O livery. One can only imagine the luxury they would have brought to trans-Pacific travel.
Edit: Fun fact, Any Concordes in IIP&O service would have 3 wide seating.
The text in the quote box above was the original text of the post. The new text is as follows.
Because in this universe the Shah of Iran never fell, the Iran Air order for Concordes was never cancelled. IIP&O, wanting a supersonic airliner, purchased the remaining 3 Concorde-A airframes for the following three routes: Wajuk - Penang - Chennai; Wajuk - Singapore - Guangzhou; & Wajuk - Singapore - Bangkok. This gets the production line for the Concorde to the longer ranged Concorde-B. From there, IIP&O orders 13 of these aircraft to serve the Imperial 'spine' routes of Shanghai - Ternate - Maya Thakurti; and Maya Thakurti - Trincomalee - Antisiranana - Dar-es-Salaam - Bandar-e-Abbas, as well as the Maya Thakurti - Honolulu - SEA-TAC line. With 16 Concordes, IIP&O becomes one of, if not the largest operator of the type around the world. A map of the routes can be found
here
However, because the longer-ranged Concorde-B gets built, there are a total of 36 orders for this type from around the world, bringing the total Concorde production to 58 airframes (4 pre-production airframes, 2 production test frames, 16 Production Concorde-A airframes, and 36 Concorde B airframes). Most of these are scattered about in two and three aircraft fleets among the world's airlines, but four of them are in service with Virgin Atlantic. As a historical note, these four aircraft ran for four years on a special route: London - Thule - Anchorage - Tokyo. Seats on these flights cost upwards of $30,000 and were always booked (this is during the Japanese property boom of the late 80s). The stops in Thule and Anchorage were for refueling, and fuel was delivered to Thule using the one ship that could do so year round - SS Manhattan, which was saved from her historic fate here by virtue of being how Branson is able to corner the market for fuel at Thule.