The supermarket is closing its site at Fenny Lock, near Milton Keynes, and transferring the work to a new centre in Daventry, Northamptonshire.

BBC: Tesco closing distribution centre near Milton Keynes

But after repeatedly opening and closing the latches, flight controllers managed to lock the wing and Discovery was cleared to dock.

BBC: Discovery docks with space station

That makes it possible to lock in a preferred price without waiting for a closing price.

WSJ: Fidelity, BlackRock's iShares teaming up on ETFs