Arguably, the "take back control" was a bigger lie than the bus. The argument in short was that if decisions are made by our politicians and we don't like them, we can elected a different set next time. Which is true, but ignores that fact that there actions while in power are not necessarily reversible. In particular if they sell something off to the private sector, it cannot easily be undone. And control of that sector is then largely lost. Equally any trade deal involves giving up some control in exchange for whatever you are getting. Depending on the deal, it might be a tiny amount or substantial, but whichever it can be very difficult or expensive to reverse. Witness the obstacles to Labour's plans to "take back control" of the railways.